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Ulysse Nardin

Various UN GMT's

 

Off the top of my head, the San Marco's are the first generation UN GMT with possibly enamel dial and solid caseback. Size is possibly 38mm and I don't think they come with big date. They are quite rare nowdays and definitely discontinued.

The GMT Big Date co-exsisting with the relatively 'newer' Dual Time 42mm, has guilloche dial with roman numerals, center second hand, sapphire caseback, UN-22 (I think base is ETA2892) and 40mm in size.

The main difference of the Dual Time is that it has bigger 42mm in size, UN-24 movement (also ETA based), sub-second and looks 'sportier'.

GMT Big Date is more suited with business attire while the Dual Time is more versatile. Saying that, I wear my GMT even when in bermuda's !

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