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Jack Mason’s Popular Strat-o-timer GMT Gets Its Most Significant Update Yet

Two distinct colorways — Alpine and Night — redefine the brand’s flagship GMT with enhanced durability, legibility, and a modern tool-watch identity.

Silver stainless steel wristwatch with white dial and black hour markers worn on a wrist.Jack Mason

Jack Mason just launched the new Strat-o-timer GMT Frontier, a watch that’s equal parts refined and rugged. The Frontier showcases the brand’s commitment to modern, tool-watch utility, with more brushed finishes, a beefier bezel, and a high-contrast dial built for legibility.

The 316L stainless steel case features a hardness coating rated to 1200 Vickers, transforming an already capable travel watch into something genuinely tough. Inside sits the Miyota 9075 GMT movement, regulated in-house to +/- 5 seconds per day. A true traveler’s timepiece, the Frontier makes it easy to track multiple time zones at once. 

At 40mm wide and 13mm thick, the Frontier wears comfortably without feeling precious. Two colorways define the collection: Alpine brings a stark white dial with black-plated indices for maximum daylight visibility. Night offers a glossy black dial that disappears, leaving only luminous markers — ideal for low-light navigation.