“In simple terms, a GMT watch is a timepiece with a 24-hour hand that displays a second time zone, in addition to the hands showing the hours, minutes and seconds. It's not a watch with more than one 12-hour-format dial, as so many people wrongly assume.

Today, Seiko introduces a new movement in the long-trusted 6R family that has a GMT function and a power reserve extended to a full 72 hours. Caliber 6R54 is presented in three new Prospex creations that are all modern re-interpretations of a Seiko classic from 1968.

The wonderful thing that happened, then, was that Seiko and Miyota made quality GMTs accessible to more watch enthusiasts than it was possible before. This is why the NH34 and 9075 truly revolutionized the micro and independent watch market.

GMT watches feature an additional 24-hour hand, so they show you two-time zones at once (sometimes three, if there is also a 24-hour bezel). While a normal hour hand travels around the dial once every 12 hours, the GMT hand travels around the dial only once every 24 hours.