Jack Mason Strat-o-timer Frontier GMT: Night
Product Overview
The Strat-o-timer Frontier GMT is the ultimate traveler’s tool. Inside the watch is the Miyota 9075 GMT movement that features an independently jumping local hour hand, regulated in-house to +/- 5 seconds per day. The brushed, stainless steel bezel is engineered for toughness and pairs well with the fully brushed 7-link bracelet. The dial and handset both feature Grade A BGW9 to ensure long lasting glow in low light environments. With a vision of becoming a legacy brand in our home state of Texas, the Strat-o-timer is assembled, and the movement regulated, in the USA.
Adventure-Proof Bezel
The Frontier GMT’s stainless steel bezel insert is machined for toughness, not decoration. Its highly scratch-resistant surface is finished with a brushed sunray texture that catches the light without sacrificing durability. Black numerals and markings are set in reverse relief, ensuring legibility stays uncompromised.
Tracks Two Timezones
The mechanical, self-winding Miyota 9075 movement allows for accurately tracking two different timezones simultaneously. The traveler GMT functionality grants the ability to adjust the local time via the crown without affecting the 24 hour hand or stopping the watch. Every movement is regulated in-house to maintain an accuracy tolerance of +/-5 seconds per day.
Built from Hardened Steel
Constructed from 316L stainless steel and reinforced by a hardness coating, the Strat-o-timer is built to tackle adventure head-on. The signature cushion case features a blend of brushed and polished finishes that highlight the subtle curvature of the case. Each surface meets at a precisely defined edge that emphasizes the case architecture.
All-Brushed Bracelet
Built to perform day after day and engineered for long-term comfort, the bracelet is designed like a proper tool. The iconic 7-link bracelet is equipped to the Frontier GMT in brushed stainless steel. Its rugged, refined look seamlessly merges the case and bracelet in a way that feels durable and deliberate. Designed to be worn, not worried about.
Light Fades. Legibility Stays.
The Frontier GMT relies on Swiss Super-LumiNova® to stay legible even after nightfall. BGW9 luminous material fills the deep reservoir of each hour marker and is precisely applied to every hand. It emits a crisp blue glow in darkness, but maintains a clean white appearance in full daylight.
Micro-Adjust Clasp
The 316L stainless steel bracelet features a concealed, tool-free system for on-the-go micro-adjustments. The clasp has been carefully engineered with 9 levels of fine-tuning to ensure the perfect fit on a broad spectrum of wrist sizes. While being worn, all the clasp’s mechanics stay hidden out of view to preserve the bracelet’s refined and uniform look.
SPECIFICATIONS
Dimensions
Case Diameter: 40mm
Case Thickness: 13.2mm
Lug Width: 20mm
Lug to Lug: 47mm
Movement
Movement: Miyota 9075
Movement Type: Automatic Flyer GMT with Jump Hour
Features: Hours, Minutes, Running Second, GMT Hand, Date
Accuracy: +/-5 seconds per day (regulated by Jack Mason)
Jewels: 24
Rotor: Custom branded rotor
Vibration Frequency: 28,800 vph
Power Reserve: 42 hours
Case & Dial
Case Material: 316L Stainless Steel
Bezel: 48-Click, Stainless Steel
Crystal Type: Sapphire
Lume: Swiss Super-LumiNova®
Caseback: Sapphire Exhibition
Crown: Screw-down
Depth Rating: 20ATM, 200m
Weight: 165g (including bracelet)
Attachment
Material: 316L Stainless Steel
Width: 20mm > 16mm taper
End Links: Solid with quick-release
Clasp: On the fly micro-adjust
Compatibility: 20mm
To keep your watch performing at its best, we recommend avoiding strong impacts, extreme temperatures, and prolonged exposure to moisture unless your watch is designed for water activities. After exposure to salt water, rinse the watch gently with fresh water and dry with a soft cloth.
For mechanical watches, regular wear helps keep the movement running smoothly. If the watch is not worn often, manual winding may be needed depending on the model. Quartz watches may require battery replacement over time.
Leather straps should be kept away from excessive water and humidity to preserve their appearance and longevity.
Because care recommendations can vary by brand and model, please refer to the manufacturer manual included with your watch for detailed operating instructions, water resistance guidelines, and service intervals.
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Brand Overview
Jack Mason
Year Founded: 2015
Country of Origin: United States
Why We Carry This Brand
Diver Watches
