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Bremont’s Supermarine 300M GMT is a 40mm mechanical dive watch with a second-time-zone display, 300-metre water resistance and a 50-hour power reserve. The collection comes in Tundra Green, Glacier Blue and Ember Red, but the colours do not share the same edition status or retail availability.
What is new in the Supermarine 300M GMT collection?
Bremont presents the collection as the next stage in the evolution of its Supermarine line. The company says the dial colours draw on Icelandic landscapes and that the watches were tested in Iceland’s “diverse and unforgiving” conditions. These are Bremont’s descriptions, not independent test findings. Its official launch video associates Tundra Green with wilderness, Ember Red with volcanic activity and Glacier Blue with icy fjords: Bremont’s launch video.
How do the three colours and editions differ?
| Dial | Edition status | Retail-channel and configuration notes |
|---|---|---|
| Tundra Green | Core model, according to Bremont | The US collection page lists bracelet and rubber-strap configurations. |
| Glacier Blue | Limited to 500 pieces | The US collection page lists bracelet and rubber-strap configurations. The UK product page reviewed is the rubber-strap configuration. |
| Ember Red | Limited to 200 pieces | Bremont describes it as exclusive to Bremont.com and Bremont boutiques. |
Edition counts and retail-channel descriptions are Bremont’s statements on its official collection page. The reviewed US listing does not establish bracelet or rubber-strap options for Ember Red.
How much does the Bremont Supermarine 300M GMT cost?
When accessed in 2026, Bremont’s US collection page listed Tundra Green and Glacier Blue at $4,400 on bracelet and $4,150 on rubber strap. The UK Glacier Blue rubber-strap product page listed £3,600 and displayed “In Stock.” Those are market- and configuration-specific listings, not a currency conversion or a guarantee of current price or stock.
#1 Best Overall
- BE-92AE automatic chronometer with 38-hour power reserve
- 40mm stainless steel Trip-Tick case construction
- Blue Temple Island rubber strap
Check the relevant local listing before buying: Bremont’s US collection page and the UK Glacier Blue rubber-strap product page. The latter page’s heading identifies the rubber-strap watch, although its technical-spec section also displays the phrase “Quick release bracelet with micro adjustment feature”; treat its price and product configuration as the rubber-strap listing rather than assuming it is the bracelet version.
What are the watch’s specifications?
The detailed figures below are from Bremont’s Glacier Blue rubber-strap product listing, accessed in 2026. They describe that configuration; the collection page identifies other strap and bracelet versions.
Rank #2
- BE-92AE automatic chronometer with 38-hour power reserve
- 40mm stainless steel Trip-Tick case construction
- Stainless steel bracelet
| Specification | Bremont-listed detail |
|---|---|
| Case | 40mm diameter, 48mm length, 13mm depth; 20mm lug width |
| Material and construction | 904L stainless steel; screw-in crown and caseback |
| Crystal | Domed, anti-reflective, scratch-resistant sapphire |
| Water resistance | 30 ATM / 300 metres |
| Movement | Modified automatic calibre BE-93-2AV; 25 jewels |
| Movement details | Glucydur balance wheel, Anachron balance spring, Nivaflex mainspring |
| Beat rate and reserve | 28,800 beats per hour (4Hz); 50-hour power reserve |
| Display and functions | Central hour, minute, second and GMT hands; date at 3 o’clock |
| Bezel | Bidirectional rotating bezel with a two-colour 24-hour aluminium insert |
How does its GMT function work?
The central hands show the local time, while the coloured-tip GMT hand and 24-hour bezel can be used to follow a second time zone. The bezel rotates in both directions and carries a 24-hour scale. It is not described as a unidirectional dive-timing bezel, so do not confuse this GMT bezel with one intended to prevent accidental extension of elapsed dive time. Bremont also lists applied Super-LumiNova indexes.
Is the Supermarine 300M GMT a rubber-strap watch?
Rubber-strap configurations are listed for Tundra Green and Glacier Blue on Bremont’s US collection page. Bracelet configurations are listed for those colours as well, so the collection is not exclusively a rubber-strap range. The specific UK Glacier Blue page linked above is for a rubber-strap configuration.
Rank #3
- GMT FUNCTION: Features a 24-hour bezel and GMT hand for tracking multiple time zones with precision and ease
- PREMIUM CONSTRUCTION: Dome sapphire crystal face provides superior scratch resistance while stainless steel case ensures durability
- AUTOMATIC MOVEMENT: Powered by reliable NH34 automatic mechanical movement, eliminating the need for batteries
- LUMINOUS DISPLAY: Bright blue lume on hands and markers enables excellent nighttime visibility
- WATER RESISTANT: 100m/330ft water resistance rating makes it suitable for swimming and snorkeling
What Bremont’s claims establish—and what they do not
Bremont calls 904L steel more resistant to corrosion and scratches, but the reviewed official pages do not provide an independent comparative test establishing superior performance. Likewise, the Iceland testing and landscape inspiration are the brand’s account, not a published third-party assessment. These specifications identify what Bremont lists; they do not amount to hands-on evaluation or comparison with competing watches.
Quick Recap
Best Value
- ⌚Imported
- ⌚GOOD QUALITY MEN'S WATCHES：PAGANI DESIGN 1682 is a Luxury automatic mechanical watches Movement Provide accurate time.
- ⌚COMFORTABLE MEN'S WATCHES: High-grade material is very comfortable to wear watches, it can match your clothes perfectly to various occasions, making you more unique and outstanding, this men's watch is very durable.
- ⌚PREMIUM MECHANICAL WATCH: Very wearable stainless steel strap sapphire glass mirror, 10 bars waterproof design diver watch, automatic mechanical movement, an excellent fashion sports watch.
- ⌚PERFECT GIFT:Wrist watches for men perfect gift for festival, family, and meeting. Stainless Steel watches luxurious fashion gift for graduation, birthday, wedding and valentine’s day. Suitable gift watches for father, boyfriend or other male classmates and colleagues, promotion to win the heart touching of our friends and family members.
Rank #4
- GMT - With its sophisticated tonal GMT index and prominent red triangle GMT hand, this watch can be set to track a second time zone.
- Stainless Steel - The durable stainless-steel case and bracelet are resistant to corrosion, rust, and daily wear and tear.
- Date Window - Easily track the date in a dedicated window beside 3 o'clock.
- Thoughtfully Detailed - This watch features a vintage-style domed acrylic crystal, a lustrous sunray dial, and faceted markers.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
