They work just like the Rolex GMT II - you set the hour hand, not the 24 hours hand. How I set mine is rotate all the hands to midnight, then set them to the local time. Then jump the hour hand forwards or backwards to the new time zone. There are various ways you can use a GMT.
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Omega Seamaster 300M GMT Noire
Omega Seamaster Aqua Terra 8500
Benson 1937 Sterling Silver Hunter
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