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Supermarine 300M — on a clear background
Watches · Bremont

Supermarine 300m

Ref. SM40-ND-SS-GN-B · In the case
The Bremont Supermarine 300m combines refined dive-watch design with robust everyday performance. Its redesigned 40mm 904L steel case features crown and bezel guards, a gradient green dial with naval-inspired crosshair detailing and Super-LumiNova® indexes for enhanced legibility. Powered for adventure and exploration, it is finished with Bremont’s newly engineered bracelet and features an engraved ocean map case back celebrating its maritime heritage.
Price on requestSpoken for in person
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  • Manufacture CalibreModified Calibre 11 1/2’’’ BE-92AO
  • DialGreen
  • StrapBracelet
Why we carry it

A refined dive watch with serious engineering underneath.

The Supermarine 300m brings Bremont’s professional dive-watch expertise into a slimmer 40mm 904L steel format, built around durability, comfort and legibility.

We carry it for its naval-inspired design, gradient green dial and versatile construction suited for both exploration and everyday wear.

For clients who value performance with refined sports-watch character, it is Bremont’s modern approach to underwater adventure.

The movement · Modified Calibre 11 1/2’’’ BE-92AO

A proven automatic calibre, refined for Bremont performance.

The Modified Calibre 11 1/2’’’ BE-92AO powers the Supermarine 500m with Bremont’s performance enhancements, delivering reliable precision and a 42-hour power reserve. Modified and tested to Bremont’s standards, it is built to withstand the demands of a professional dive watch.

Servicing is handled through Bremont’s authorised service network, with specialist care to maintain the calibre’s long-term reliability.

Calibre
Modified Calibre 11 1/2’’’ BE-92AO
Type
Automatic
Frequency
28,800bph (4Hz)
Parts & jewels
25 jewels
Power reserve
50 hours
Specifications

The watch, by the number.

The case

Diameter
40 mm
Thickness
12 mm
Lug width
20 mm
Material
904L stainless steel
Finishing
Brushed and polished 904L stainless steel
Crystal
Domed anti-reflective, scratch resistant sapphire crystal
Case back
Stainless steel screw-in and decorated closed case back

The Dial & Functions

Colour
Green
Material
Galvanic metal
Finish
Green gradient finish
Pattern
Naval-inspired crosshair pattern
Indices
Applied indexes infilled with white Super-LumiNova® (Blue emission)
Hands
Polished nickel-plated hour, minute and second hands infilled with white Super-LumiNova® (Blue emission)
Seconds
Central sweep seconds with Super-LumiNova®
Functions
Central Hour/Minute/Second Unidirectional rotating bezel

Bracelet & Water Resistance

Bracelet
Quick release bracelet
Clasp
Micro-adjustment clasp
Crown
Screw-in crown
Water Resistance
30ATM, 300 metres
In the curation

A closer look at the wall.

See the full curation →
Supermarine 300M Date — on a clear background
Supermarine 300m Date
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Altitude Chronograph Pulsograph Valjoux 23 — on a clear background
Altitude Chronograph Pulsograph Valjoux 23
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Altitude 42mm Chronograph GMT — on a clear background
Altitude 42mm Chronograph GMT
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Begin a viewing

Hold it once. Turn it over.

A watch makes more sense in the hand than on a screen — particularly through the sapphire back. Book a viewing at 900 West Hastings St., Vancouver and we will put a loupe in your hand.

Begin a viewing →