Back when I wrote about the recently released titanium version, I mentioned that Jack Mason’s Strat-o-Timer GMT had become impossible for me to ignore. For years, the brand existed somewhere on the periphery of my collecting radar. I could see the appeal, I understood the specs, and I knew there was a loyal following, but it never quite demanded my attention. The titanium release changed that for me. Now, with the introduction of the Strat-o-Timer GMT Frontier, it feels like Jack Mason is continuing that trajectory with more focus and a clearer sense of identity.
Dimensionally, the Frontier keeps the proportions that have made this line so approachable. The stainless steel case measures 40mm in diameter, 47mm lug to lug, and 13mm thick including the crystal. Those numbers sit comfortably within the modern enthusiast sweet spot, especially for a watch offering a true GMT function and 200 meters of water resistance. The case and bracelet are predominantly brushed and both receive a hardness coating rated up to 1,200 Vickers to improve scratch resistance in daily wear.
The bidirectional GMT bezel has been redesigned with crisp markings and a subtle sunburst finish. It adds texture without pulling the watch away from its tool-oriented character. Combined with a screw-down crown and sapphire crystal, the overall package reads as durable and considered rather than decorative.
At launch, the Frontier arrives in two colorways. The Alpine version features a glossy white dial paired with black-plated hands and indices, delivering strong contrast and a clean, high-visibility look. The Night edition opts for a glossy black dial with bold luminous markers, leaning into a darker, more subdued aesthetic. Both options maintain a symmetrical layout with applied indices, a lollipop central seconds hand, an orange GMT hand for quick differentiation, and a date window positioned at 6 o’clock.
Powering the Strat-o-Timer GMT Frontier is the Miyota 9075, a “true” traveller GMT with an independently adjustable local hour hand. The movement operates at 28,800 vibrations per hour, offers a 42-hour power reserve, and is regulated in-house by Jack Mason to plus or minus 5 seconds per day. Within the current landscape of sub-$1,500 GMT offerings, that combination of architecture and regulation speaks to the brand’s ongoing effort to be taken seriously by enthusiasts.
The watch is delivered on a solid stainless steel bracelet with a micro-adjusting clasp and a 20mm lug width, leaving room for leather or tropic-style rubber options, both of which the brand also offers. Pre-orders are open now, with deliveries expected around February 27. The price is set at $1,099.
Out of these two? I’d pick the white one. But, what stands out to me about the Frontier is less about any single specification and more about what it represents in context. The Jack Mason Strat-o-Timer GMT started as a strong concept that felt adjacent to the enthusiast conversation. Over the last couple of iterations, it’s become central to it. The Frontier feels like another deliberate step in that direction, refining durability, tightening the aesthetic, and reinforcing the mechanical credibility that collectors tend to prioritize.
Co-Founder & Senior Editor
Michael Peñate is an American writer, photographer, and podcaster based in Seattle, Washington. His work typically focuses on the passage of time and the tools we use to connect with that very journey. From aviation to music and travel, his interests span a multitude of disciplines that often intersect with the world of watches – and the obsessive culture behind collecting them.