View single post by stew77
 Posted: Wed Feb 9th, 2011 12:27 pm
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stew77



Joined: Thu Mar 26th, 2009
Location: Colorado USA
Posts: 10254
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 If I'm reading your question correctly Marc, you are asking about a true "travelers GMT" which you can set the GMT hand to GMT time (or your HOME TIME which is how I prefer to use it). 

Then when traveling from timezone to timezone you can adjust the main hour hand in increments of 1 hour jumps forwards and backwards without affecting the GMT hand (and also without hacking/stopping the seconds hand).

This is the type of modified GMT movement that the Omega SMP GMT, and Rolex GMT II use (I think there are others such as IWC that also use this type of modified GMT movement).  As Oscar stated above, I think there are also perpetual calendar models from Seiko that use this type of movement.

The negative of this setup is that you loose the ability to quick-set the date independently through the crown...and must set the date via rotation of the main hour hand in increments of 1 hour (really not a big deal IMO). 

Now, the standard ETA-2893 used more commonly on a number of GMT's does not operate in this way...as Oscar pointed out above, this movement allows you to quickset the GMT hand (while also allowing you to quickset the date)....but, you have to hack the movement and set the main hour hand in the conventional way which also stops the seconds.