(Image credit: MB1K on Flickr)
The 2893 is the GMT version of the ETA 2892. It adds a 24-hour hand that can be used to track a second timezone. GMT complications, one of my favorites, were introduced by Rolex with the GMT Master for Pan-Am pilots flying international routes, where the 24-hour hand would be set to GMT (later renamed UTC) time.
The best GMT movements allow you to to set the normal hour & minute hand without changing the GMT time. That way, when you change timezones, the local time is displayed normally (important when you're jetlagged!) and the 24-hour hand indicates home time or GMT time as preferred. Really nice movements (e.g. the Rolex, and the modified 2893 in the Omega GMT) set the time in one-hour jumps, making it trivial.
Doesn't work for fractional GMT offsets.
Anyway, the 2893 is not like this - setting the normal time moves the 24-hour hand. Which means that you either have to set both, or use the 24-hour hand for local time, as it can be set independently.
Here's ETA's instruction sheet:
Specs
- Debut 1992
- Size 11.5 ligne, 4.2mm thick
- 21 jewels, Shock protection varies by grade
- 51 degree lift angle
- Automatic, unidirectional winding
- Rate: 28,800 vph
- Power reserve: 42 hours
- hacking
- Handwinding
- Hour, minute, central seconds, Quickset date, 24-hour hand
- Accuracy, decoration and Adjustments vary by ETA grades
- Hours, minutes, sweep seconds.
- Self-winding mechanism with ball bearing.
- Date indicator, corrector.
- Stop second device.
- Regulator system ETACHRON and regulator corrector.
- 28.800 vibrations per hour; 4 Hz.
- 24 hour hand or second time zone.
- 21 Jewels.
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Produced by ETA
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