Thursday, April 3, 2014

What is a Minute Repeater?


A repeater is a complication in a mechanical watch that chimes the time on demand by activating a push or a slide-piece. Different types of repeater allow the time to be heard to varying degrees of precision; from the simple quarter-repeater which merely strikes the number of hours and quarters, to the minute repeater which sounds the time down to the minute using separate tones for hours, quarter-hours and minutes.

Originating before widespread use of electricity, they allowed the time to be determined in the dark and they were also used by the visually impaired. Today minute repeaters, one of the most complex repeater mechanisms, are coveted by collectors and watch lovers alike as rare masterpieces of precision mechanical engineering.

Uhren Von UHR (UHR-321)


Case diameter:40mm
Thickness:15mm
Band lug width:20mm
Lug-to-Lug:46mm
Weight:128g
Movement/Caliber:ETA 2824-2
Product No.:UHR-321
Glass:mineral glass
Dial:black
Bracelet Material:stainless steel
Clasp:deployment clasp
water proof:10 ATM
Dial numerals:Arabic
luminescent numerals
luminescent hands
screw-down crown
EUR 299 (including 19% tax)
Warranty: 5 years

According to their website, "Watches from UHR are mechanically reliable and above all not expensive. Then watches from UHR are made in Germany. To be precise from Baden-Württemberg. The people from Baden-Württemberg are still today considered as being especially thrifty because Southern Germany was once very rural and poor. Today Baden-Württemberg is the most successful region in Germany and thrives on the creativeness, innovation and inventiveness of its citizens."


Where do the components for watches from UHR come from?
Almost all components used in watches from UHR originate from well- known and renowned European part manufacturers. Only movements from the Swiss manufacturer ETA are used. More than 85 percent of the value-added from UHR watches is from Europe and here, in particular, from Switzerland and Germany.
Who manufactures the UHR watches?
Like many renowned watch manufacturers, watches von Uhr uses so-called Temineure. They could be both single watchmakers and also watch manufacturers, mostly based in Switzerland, who assemble watches for several watch brands. As a rule, the necessary components are ordered and delivered by the watch brand.

Wednesday, January 29, 2014

STEINHART "OCEAN 1 VINTAGE red"






Technical Details
Type: OCEAN 1 VINTAGE red
Item no.: T0207

Movement
ETA 2824-2 Swiss Made automatic, hacking second 
Jewels: 25 jewels

Functions
hour and minute 
central second hand
Date on the “3”

Case: stainless steel
Back: Stainless steel screwed, engraved
Diameter: 42 mm
height: 13 mm
Weight: 190 g
Dial: black
Crystal: domed sapphire crystal, double anti-reflection coating on the inside
Bezel: Sainless steel black
Indices: Superluminova C3, green
Lug width: 22 mm
WaterRes: 300 metres/990 feet 30 ATM acc. to DIN
Strap: stainless steel 22 mm, screwed
Buckle: stainless steel, safety clasp

295 EUR without 19% VAT

Super-LumiNova


Super-LumiNova is a brand name under which strontium aluminate–based non-radioactive and nontoxicphotoluminescent or afterglow pigments for illuminating markings on watch dials, hands and bezels, etc. in the dark are marketed. This technology offers up to ten times higher brightness than previous zinc sulfide–based materials.
Super-LumiNova is based on LumiNova pigments, invented in 1993 by Nemoto & Co., Ltd. of Japan as a safe replacement for radium-based luminous paints.[1] Nemoto & Co. was founded in December 1941 as a luminous paint processing company and has supplied paint with watch and clock industry for over 70 years.
Besides for timepieces Super-LumiNova is also marketed for application on:
  • Instruments: scales, dials, markings, indicators etc.
  • Scales: engravings, silkscreen-printing
  • Aviation instruments and markings
  • Jewelry
  • Safety- and emergency-panels, signs, markings
  • Aiming posts
  • Various other parts
This type of phosphorescent pigments, often called lume, operate like a light battery. After sufficient activation by sunlight or artificial light, they glow in the dark for hours. Larger markings are visible for the whole night. This activation and subsequent light emission process can be repeated again and again, and the material does not suffer any practical aging. Strontium aluminate–based pigments have to be protected against contact with water or moisture, since this degrades the light emitting quality.

source: http://en.wikipedia.org/wiki/Super-LumiNova

Tuesday, January 21, 2014

ETA 2892

The Little Engine that Could
An indepth look at the ETA 2892
 

Hans asked me a while ago to do a write up on the ETA 2892. Both because of its enormous popularity and also the fact that it is deemed accurate and reliable enough to be used as a base movement for many high-end manufacturers complications. 
There’s not much I can add to Walt Odets’ history and evolution of the movement itself, except to say that most changes and updates were done in order to improve the efficiency of the automatic winding. 
The first problem arose because originally the basic movement beat at a leisurely 18,000 beats per hour (BPH) and had a fairly large diameter balance wheel. When ETA upgraded the movement by increasing the beat to 28,800 BPH, this required a much stronger mainspring than what was used previously. This required upgrading the automatic unit by improving its winding efficiency in order to deal with the extra resistance due to the stronger mainspring. 
No sooner had the above problem been adequately dealt with, when ETA gave themselves more winding efficiency headaches by reducing the diameter of the movement from 28mm to 25.6mm so that it could be used in a wider range of cases. Hence the change in model number from 2890 to 2892. Thickness remained unchanged, i.e. 3.6mm for both models. This had the effect of reducing both the diameter and mass of the oscillating weight. A problem that was finally put to rest with modifications that resulted in the latest model, 2892/A2. 
For the more technically minded, the final modifications to the automatic winding was to reduce the chamfer around the circumference of the oscillating weight – thereby increasing its mass. And to switch the stud and the jewel which supported the intermediate reduction wheel. This wheel, which drives the ratchet driving wheel, originally had a stud, but now has a jewel. The stud has now replaced the jewel in the upper part of the automatic winding bridge. This resulted in less winding friction due to this wheels much greater stability. Omega (and Girard Perregaux) have increased the winding efficiency further by reducing the diameter of the ball bearing support. 
I have ‘dissected’ a Bulgari labeled Girard Perregaux modified 2892 for you. So let’s take a closer look at it starting with its source of power, the mainspring. While not being very high, this is quite a strong mainspring and provides the movement with a more than adequate supply of torque. The barrel arbor has a small diameter relative to the size of the barrel. This is in keeping with most modern movements that use fairly long mainsprings. This results in the mainspring taking up about 75% of the available space, as opposed to older movements whose mainsprings only utilized about 50% of it.



Picture 2 shows the barrel complete. Like the rest of the watch train, it utilizes micro gear toothing. Also known as ETA style teeth. This particular shape, invented by ETA, was chosen for both the wheels and pinion leaves, in order to improve the efficiency of energy transmission by keeping friction to a minimum. Most modern movements, regardless of the factory producing them, have switched over to these style teeth. I think it was Curtis, after much research, who gave us a pretty accurate description of these teeth quite a while back.


What amazes me as a watchmaker, is how well these teeth work. One can easily check this out by assembling the going train of any high grade watch that has the epicycloidal teeth. Without oiling any of the pivots, give the great wheel a push with a thin oiler. Now do the same with an ETA 2892, or even a Rolex 3135 for that matter. The wheels of the latter turn much more freely. 
Picture 3 shows the complete train and the escapement. Nothing fancy there, just overall good basic engineering. Note that the wheels are made of glucydur and the pinion leaves are made of steel. Dissimilar metals rolling together produce considerably less friction than if they were made of identical material. All the wheels in quartz watches, high grade ones included, are made of brass. Due to the fact that there is much less torque in a quartz movement, there is no need for the greater strength of the glucydur wheels.


The main plate, like almost all of the rest of the bridges and plates, is made of stamped brass. Most manufacturers rhodium plate these, both for aesthetic reasons and corrosion resistance.


Here is the going train and barrel sans bridges. The brass colored wheel on the barrel is the ratchet wheel.


The inner workings of the wheels that fit under the barrel bridge. The ones on the left facilitate hand winding, while the one on the right, the ratchet driving wheel, is the final working wheel of the automatic unit. The spring, together with the smaller diameter steel wheel, serves a double function. The part engaged with the brass colored wheel functions as a click. While the part resting on the steel wheel, functions like a clutch. Forcing the wheel to be engaged during hand winding, and allowing it slip and move out of the way when the auto winding is engaged. The football (rugby for our European readers) shaped post that it turns on determines its free play in both directions.


Picture 7 shows the barrel bridge fully assembled and ready to be installed.

Here is the complete movement sans the balance wheel.


Picture 9 shows the balance wheel installed. The 9mm diameter balance is a good compromise between weight and size. Both the ETA 7750 and Rolex 3135 have approximately 10mm balances. In ETA’s cheaper versions the balance is made of nickel. The ETA-Chron system makes centering the hairspring and adjusting the gap between the regulator pins very quick and easy. Unfortunately it also makes replacing the balance wheel complete quite a bit more difficult. The screw for fine regulation of the timekeeping, should not be used for more than a 5 second adjustment. Ideally it should be centered, as shown.


The dial side of the movement with stem, setting and winding system installed.


The complete dial side ready to be fitted with a dial. The large brass wheel at the 11 O’ clock position is the calendar driving wheel. The brass tooth peeking out from under the steel wheel cover, is the tooth that actually flips the date. This ingeniously simple design has been copied by many other manufacturers due to its simplicity, reliability and the fact that it gives a virtually instantaneous date change without needing extra parts. It’s also foolproof, such that one can change the time whether it’s engaged or not without damaging anything.


The automatic winding train. The wheel second from the right is the reversing wheel. This wheel, together with the middle wheel, facilitates winding in both directions. The first wheel on the left is the intermediate reduction wheel. One can clearly see the jewel that replaced the stud. It sits on the small stud fitted at the top 12 O’ clock position of the automatic winding bridge.

Here is the auto winding unit complete, ready to be installed in the movement. With weight upside down one can clearly see the heavy weight riveted to its circumference.


Voila!! The complete movement ready to be installed in the watch case.


So what exactly is it that makes this movement so special? Or to rephrase the question, how come this movement is so accurate and reliable? Beats me if I know!! To be perfectly honest, I think that it is just a great design with compromises that have been intelligently chosen and superbly executed in its best incarnation. It incorporates all the latest knowledge and advances in both materials and movement design. Its generous supply of available torque means that it will not be easily stopped, even when powering extra complications. 
If I was given carte blanche, what would I do to improve this movement? 
Firstly, I would make all the bridges out of invar. This wouldn’t do anything for its accuracy, and probably as much for its reliability. But as a watchmaker it distresses me to see high end movements made out of brass. Brass is just so…… cheap. It also has a very poor coefficiency of expansion. Invar has a virtually zero coefficiency of expansion through a very wide temperature range. It’s also considerably stronger than brass. Being stainless obviously obviates the need to plate it too. How come Hamilton, Elgin et al produced zillions of inexpensive movements made of invar or similar alloys, but Rolex, JLC, Patek Phillippe etc make their very expensive movements out of cheap brass?? 
Secondly, I would do a complete redesign of the automatic winding unit to improve its efficiency even further. I would eliminate the reversing wheel and incorporate a JLC style switching rocker. And I would further reduce the diameter of the ball bearing oscillating weight support. That’s one of the reasons for the Rolex’s winding efficiency, the weight spins on a tiny diameter post. Unfortunately they’ve taken winding efficiency to the extreme. The net result is that said tiny diameter post doesn’t offer enough support to the weight. This results in the weight scraping up against the movement bridges, even with mild shocks. 
So how does it compare to the competition? There are some movements that match it in terms of accuracy and reliability, but in my humble opinion, none exceed it. The Rolex 3035 and 3135 match it toe to toe. But they are a lot thicker and considerably more expensive too. The PPs, while being very pretty to look at, do not match it for accuracy and are more delicate as far as reliability is concerned. Of course they’re also slightly thinner, so that does put them at a disadvantage. The JLC 889/2 does match it for accuracy, but is also too delicate to give it any competition in the reliability department. The main reason for the latter is its very weak mainspring. The whole design, while being well thought out and superbly executed, relies too much on everything being just perfect. It is just thrown out of wack too easily, when even minor things go out of adjustment. I don’t have too much experience on the Blancpain/Piguet movements. But from the few that have crossed my bench, they don’t seem to deliver the same accuracy that the 2892 has no trouble delivering. Let me know if I’ve left any of your favorite movements out, and I’ll gladly comment on them.


source: http://www.chronometrie.com/eta2892/eta2892.html

Saturday, January 18, 2014

EPOS Passion Ref. 3403OH - Open Heart








Mechanical hand-wound semi-skeleton movement Unitas 6498-2, engraved. 
Visible balance wheel at 8 o’clock, small second hand at 6 o’clock. 
Stainless steel case with rose PVD coating and anti-reflective, scratch-resistant sapphire crystal. 
Screwed see-through back. 
Water resistant to 100 m. 
Black dial decorated with the “Côtes de Genève” pattern, applied luminescent indexes. 
Leather strap.

Case dimension: 
Thickness: 10,9 mm
Diameter: 43  mm





The top 5 watch brands

Leading watches
A. Lange & Söhne
Patek Philippe
Jaeger-LeCoultre
Audemars Piguet
Vacheron Constantine


A. Lange & Söhne has always defined superior craftsmanship in all their watches from the inside to the outside. They are a German watch maker with extremely high horological standards in their watch complexes and movements.
Under their flagship, there are many superb and elegant timepieces that have attracted various collectors.
The company was founded in 1845 by Ferdinand Adolph Lange. They were making good watches in Saxony region of Germany until World War II when their workshops were largely destroyed.
Only after the fall of the Berlin Wall in 1989, Walter Lange, the fourth generation family, decided to revive their family tradition and brand. They restarted their business in 1990 in the city of Glashütte. 1
Their new generation of A. Lange & Söhne watches was created in 1994 with their very own movements. There was no turning back from then onwards and their business started to flourish.
Their mens watches are known to be exquisite and valuable among many collectors around the world. This boils down to the creation of its own movement and its focus on self assembly in Glashütte workshops.
Another important reason for their high value is because they produce only in 18-karat gold or platinum. And they produce limited quantities of a few thousand a year of these mechanical mens watches to make it into important collectible items.
Their intial models in their modern collection were Lange 1, Saxonia, Arkade and Tourbillon pour le Mérite. There were only small amounts of productions for these pieces that comes only in a few hundreds.
A. Lange & Söhne is also known for its patented Lange oversized dates in all their mens watches. This further creates value for the company’s brand and design work.
Of great significance would be A. Lange & Söhne Lange 1 Moonphase watch. This is a unique moonphase not found in other watches.
Their mechanical movement allows the moonphases to depict exactly like the moon time by having it in constant motion, whereas moonphases in other watches usually click into position after passing certain segment of time.
A. Lange & Sohne Lange 1 Moonphase
The accuracy of its moonphase is also unbelievable. It is just 0.02 percent deviation from the actual moon’s orbit. The Lange 1 Moonphase comes in 18-karat yellow, pink gold or in platinum with 398 individual parts within.
Other great Lange collection of mens watches:
·         Grand Lange 1 Luna Mundi
·         Grand Lange 1
·         Lange 1 Luminous
A. Lange & Söhne is also known for its patented Lange oversized dates in all their mens watches. This further creates value for the company’s brand and design work.
In 1997, the Langematik was launched. These range of watches carries the Sax-O-Mat movement. The Cabaret was also introduced within that year. Its unique rectangular shape created much originality among other mens watches.
The ranges of Langematik:
·         Langematik with Oversized Date
·         Langematik Perpetual
·         Grand Langematik
To celebrate the turn of the century, in 2001, the company showcased their new range the 1815 and the 1815 Power Reserve.



Patek Philippe is the creation of two men that transformed the world of watchmaking. The meeting between Antoine Norbert de Patek and Jean Adrien Philippe occurred in 1844 and they began their partnership in 1845 as Patek & Co. before changing their current name in 1851.
Some of their track records are:
·         1863: Innovation of free mainspring that led to the invention of the automatic watch
·         1868: Created the world’s first wristwatch
·         1881: Patent for their regulating system by an eccentric cam
·         1889: Patent for their perpetual calendar system with a self-regulating calendar
·         1902: Patent for their split-second chronograph
·         1932: Charles and Jean Stern acquired Patek Philippe
·         1933: Henry Graves, Jr purchased the Graves watch for $11,750. It resold in 1999 for $11 million
·         1956: Created first battery-operated watch for industrial use
·         1986: Patent for its secular perpetual calendar with retrograde indicator with accuracy for 400 years
·         1989: The auctioned Caliber 89, a masterpiece with 1,728 components and 35 horological functions that took 9 years to build, went for $3.2million
·         1996: Patent for its annual calendar
·         1996: Calatrava, minute-repeater + perpetual calendar + moonphase, created in 1939 auctioned for $1.3 million compared to its 1981 auction at $115,000
·         2000: Star Caliber 2000, pocket watch with 21 complications and 6 patented components
With its long history of outstanding contribution and revolutions (more than 60 patents under their flagship) toward the world of watchmaking, there is no doubt for the strong following among collectors for its timepieces. In 2001, they created a unique and very complicated wristwatch known as Sky Moon Tourbillon (ref. 5002).


The rarity of this watch is its display of its minute repeater, perpetual calendar (including moonphase), retrograde date using central hands. At its rear dial shows representation of the sidereal hour and the visible sky part (based on the sky visible from any town).
It has white central hands to indicate the sidereal hour which is the time referred to the passage of the same meridian with respect to a certain star.


Another outstanding creation was in 2002 for its
Sky Moon watch ref. 5102. It reflects the exact configuration of the night sky complete with movements of the stars, position of the moon, and the moonphases within the lunar cycle.
It took Patek Philippe 2 years to create this outstanding achievement that incorporated two of its greatest developments from Star Caliber 2000 and Sky Moon Tourbillon. It uses a system of different layered discs to run the lunar day, lunar cycle, and sidereal day where each rotates in different durations and also differ from the solar time.
Patek Philippe continues to create another first time in watchmaking history, 10 days Tourbillon. It spent 3 years in research and development to achieve 10 days of power reserve and a manual-wind tourbillon with COSC-certified chronometer.
It uses a 2 mainspring barrel and a tourbillon escapement in rectangular movement. The transparent caseback reveals the intrinsic tourbillon bridge and tourbillon cage what wraps the Gyromax balance wheel. The other 10 days power reserve is Ref. 5100.





With a strong and focused dedication to creating the finest and most luxurious watches, Audemars Piguet is undeniably one of the most well-known watch makers to date. It was founded in 1875 by Jules Audemars and Edward Piguet during their early twenties.
Their craftsmanship and eye for details has allowed them to create in 1882 the Grande Complication watch. This is a minute repeater, perpetual calendar, moonphase, and chronograph. 1889, a newer Grande Complication was produced with similar functions as well as a split-second chronograph.
Their innovative characters made them moving the watch industry literally with many “first” creations. Examples are:
·         In 1915, they made the smallest minute-repeater movement
·         1925, the slimmest pocket watch
·         1945, the slimmest manual winding wristwatch
·         1967, the slimmest automatic movement
·         1972, the famous collectible Royal Oak
·         1992, the Triple Complication wristwatch
·         1994, Grande Sonnerie using 410 mechanical pieces to create one of the most complicated known movement
·         1999, the Tourbillon Minute Repeater Split Second Chronograph Jules Audemars watch
·         In 2000, an extremely complex masterpiece, the Jules Audemars Equation of Time with tourbillon escapement wristwatch was made. In the same year, the Edward Piguet Minute Repeater with chimes and a limited edition of 20 platinum pieces was created
·         2001, another two masterpieces which are first of its kind, the Edward Piguet Tourbillon with power reserve, chronograph and dynamograph; and the Jules Audemars Metropolis Perpetual Calendar (first to have both a perpetual calendar that displays local time in every 24 key zones).
The flagship line in Audemars Piguet is the Royal Oak. The first Royal Oak was made in honor of the British Royal Navy’s HMS Royal Oak battleship. The ship has steel plates and octagon-shaped gun ports.
These characteristics inspired the hexagonal screws fastening the bezel on the Royal Oak watch. From then on, all the Royal Oak collections contain this unique design.
A list of the Royal Oak mens watches:
·         Royal Oak Concept
·         Royal Oak City of Sails
·         Royal Oak Nick Faldo
·         Royal Oak Automatic
·         Royal Oak Chronograph
·         Royal Oak Dual Time
·         Royal Oak Perpetual Calendar
There is another interesting design to celebrate the third millennium is called the Millenary. This range has an unusual case that is of horizontal oval shape but with an original dial to match. There are a few choices available from day/date, chronograph, time-zones, and gem-set.



Jaeger-LeCoultre was the collaboration of the Jacques-David LeCoultre (Antoine LeCoultre’s grandson) and Parisian chronometer maker, Edward Jaeger in 1903. They have produced many world class inventions in their timepieces. One of the most famous created in 1928 was the Atmos which relies its energy from the temperature variations.
Under its flagship are many patents established by the company. They invented the Caliber 101 in 1929 which was the smallest caliber created then consisting of 98 elements and weighs only 0.9 grams. Then in 1956 they launched the world’s first automatic movement wristwatch equipped with an alarm mechanism, known as Memovox,
Then in 1958, the geophysic chronometer that comprises of a chronometer antimagnetic at 600 amp/meter meant for sailors. Its valuable mechanism was proven useful during the expedition by crew members of The Nautilus.
In 1992, the Master Control 1000 Hours series was introduced. It was tested up to 1000 hours that was way above the COSC requirements. Then they also launched the Reverso 101 that incorporates the Caliber 101 to be the smallest mechanical movement in the world. In year 2000, the company was bought over by Richemont Group who continued their legacy as well as create masterpieces with a difference.
In 1931, Jaeger-LeCoultre launched the Reverso collection of watches that was an immediate hit among watch enthusiast. From then till now, the company has continuously introduced newer collections of Reverso into the market.
As its name depicts, the watches barrel-shaped case allows reversible double-face. Some of the latest designs well-noted are the Reverso Gran'Sport Chronograph and Reverso Gran'Sport Duo. The Gran’Sport was first launched in 1998 and required 7 years of research and development.
The largest case created in the Reverso ranges are the Reverso Grande Date and the Reverso Grande Reserve. The Grande Date contains a large date, an amazing 8-day power reserve, and a small second counter. For the Grande Reserve, it also has the 8-day autonomy, small second counter, and a patented jumping power reserve at the reversible face.
Check out the other Reverso collection which is the
  Reverso Duo.
To commemorate Antoine LeCoultre, Jaeger-LeCoultre launched a Master Eight Days in 2004 based on the Master Control mechanism. It comes in 18K pink gold and also 200 pieces of limited edition with platinum case.
Jaeger LeCoultre Master Eight Days
The watch uses a mechanical and manual winding movement with sub-counters covering from power reserve, small seconds, and day/night timing. It also has a beautiful LeCoultre signature on the middle of the case for every of its limited edition pieces.
Discover more about the newer Master Eight Days Perpetual SQ created in 2007.
Check out the other great Master Collections where all are tested for over 1,000 hours and so engraved with the “Master Control 1000 Hours”.
·         Master Grande Memovox
·         Master Perpetual
·         Master Moon
·         Master Ultra-Thin
·         Master Geographic
·         Master Grand Tourbillon
There is also another range known as Master Compressor which is different from the Master Collections above. It does not have the 1,000 hours testing. This range instead has a 44-45 hours power reserve within its movement.
·         Master Compressor Memovox
·         Master Compressor Geographic
·         Master Compressor Automatic

http://www.mens-watches-guide.com/rolex.html