The Altitude Chronograph GMT is the ultimate evolution of Bremont’s aviation tool watch — combining the proven resilience of the MB series with the added functionality of a chronograph and GMT complication.
Housed in a 42mm Trip-Tick case made from ultra-rugged 904L stainless steel, with a black DLC-coated centre barrel, the watch has been engineered to withstand the harshest conditions. Inside, the chronometer-rated BC781 movement delivers a 62-hour power reserve and features a quick-set date, hacking seconds, and independent GMT hand.
Beneath the surface, the automatic movement is suspended within a flexible rubber mount to absorb shocks and minimise impacts. The Altitude Chronograph GMT has an open case-back, revealing the movement’s fine finishing in gunmetal grey with Geneva Stripes. The open case-back retains the anti-magnetic shielding, which is provided by a soft iron ring around the movement, based on Faraday Cage principles.
The dial design is clean, legible, and cockpit-inspired, with applied Super-LumiNova® numerals and indexes, and recessed chronograph subdials. A red-tipped GMT hand tracks a second time zone against a 24-hour day/night scale, while the rotating seconds subdial at 9 o’clock takes the form of a tri-blade propeller — a nod to a Bremont military project.
For the Altitude Chronograph GMT, Bremont introduces a new bracelet design, crafted in brushed 904L stainless steel. Featuring quick-release functionality and engineered for maximum flexibility, it is secured with curved bars that enable smooth articulation and exceptional comfort.
Bremont Altitude Chronograph GMT
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Movement
BC781AC movement
25 Jewels
Glucydur balance wheel
Anachron balance spring
Nivaflex mainspring
28,800bph (4Hz)
62-hour power reserve
Decorated Bremont rotor -
Functions
Central GMT/Hour/Minute
Chronograph centre sweep seconds hand
Small seconds counter at 9 O'clock
Chronograph small counters with 30 minutes counter at 12 O'clock and 12 Hour counter at 6 O'clock
Date at 6 O'clock -
Case
Satin & polished 904L stainless steel Trip-Tick case construction with Brushed Black DLC barrel.
Inner anti-magnetic movement protection ring.
Protective anti-shock movement mount.
Case Diameter: 42mm
Case Length: 49.62mm
Case Depth: 14.7mm
Lug width: 22mm -
Case Back
Decorated 904L stainless steel open case back
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Dial & Hands
Brushed Black Galvanic metal dial including:
Numerals and Indexes filled with white Super-LumiNova® (Blue emission).
Grey and Black Day and Night 24 hour dial ring.
Brushed sub-dial at 9 O'clock, 12 and 6 O'clock Sub-dials with fine CD Lines
Gloss Black Hour and Minute hands, filled with white Super-LumiNova® (Blue emission)
Gloss white chronograph sweeping seconds hand
Red tipped GMT hand, filled with white Super-LumiNova® (Blue emission)
Gloss White 12 and 6 O'clock sub dial hands
Gloss black Propeller design Running Seconds hand at 9 O'clock with white Super-LumiNova® tips -
Crystal
Glass Box anti-reflective sapphire crystal.
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Water Resistance
10 ATM, 100 metres.
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Strap
Quick-release 904L stainless steel bracelet
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Weight
88.8g (watch head only)
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Rating & Certification
Chronometer rated to ISO 3159 standard
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