Another option that occurred to me once I realized that the Airman is a 24-hour watch (which I don't want) is that the new Autavia has a rotating 12hr bezel, which can be easily used to track a second timezone. No GMT function though.
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They're nasty thick, but a slim NATO helps, and the truth is that while TAG is a directionless mess, they can still make a mesmerizing dial. $3500 all day on the secondary market
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