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Bremont Supermarine Jet GMT 40mm Stainless Steel and DLC
Ref. S302-JET-R-S
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Stepping up in the same colour and case shape
The Supermarine name at Bremont carries a specific obligation: the watches bearing it are built to be used in and around water, seriously. The S302 sits at the heart of that line — a 40mm case in stainless steel with a DLC treatment that gives the whole thing a matte blackout finish, paired with the GMT function that makes it genuinely useful across time zones rather than decorative. At 13mm thick and 40mm across, this is a diver that disappears under a sleeve. Most watches rated to 300m carry that depth visibly in their proportions; this one does not, which is a considered trade-off between real capability and everyday wearability that Bremont has quietly made. The BE-932AV movement is chronometer-certified to ISO 3159, which is a meaningful bar — not every movement in this bracket clears it — and the 50-hour power reserve gives a weekend's slack without winding. On a rubber strap with a traditional buckle, it sits flat and secure without the bulk of a metal bracelet, which suits the tool-watch intention better than it might first appear.
- Reference
- S302-JET-R-S
- Brand
- Bremont
- Collection
- Supermarine
- Case size
- 40mm
- Case thickness
- 13mm
- Case material
- Stainless steel
- Case shape
- Round
- Dial
- Black
- Crystal
- Sapphire
- Movement
- Automatic
- Calibre
- BE-932AV
- Functions
- GMT
- Water resistance
- 300m
- Bracelet / strap
- Rubber strap
- Strap colour
- Black
- Clasp
- Buckle
- Lume
- Luminous
- Condition
- Pre-owned
- Retailer
- Mappin & Webb
Additional specifications
- Power reserve
- 50 hours
Learn more about Bremont
Nick and Giles English founded Bremont in 2002, four years after their father died in a plane crash that Nick survived. All three had restored and flown vintage aircraft together, and the brand that emerged is inseparable from that. The name comes from Antoine Bremont, a French farmer who sheltered the brothers after an emergency landing.
Bremont set out to rebuild British watchmaking, which had effectively ended in the twentieth century. The early watches used Swiss movements in British-designed cases, with the Trip-Tick three-part case construction and a hardened outer barrel treated to over 2000 Vickers.
The military and aviation work is real rather than thematic. Bremont holds contracts with squadrons across the RAF, the US Air Force, and other services, producing issued watches for specific units, and has made watches for Martin-Baker ejection seat survivors — tested to the ejection forces themselves.
The company has also built watches incorporating material from historical objects: oak and copper from HMS Victory, aluminium from the Wright Flyer, and steel from Bletchley Park.
The manufacturing ambition advanced with the opening of a facility in Henley and the release of the ENG300 series in 2021, the first Bremont movement designed and largely made in England. Production is in the low tens of thousands annually.
- 2002
- Nick and Giles English found Bremont.
- 2007
- The first watches ship with the Trip-Tick case.
- 2009
- The Martin-Baker collaboration begins.
- 2021
- The ENG300 becomes the first English-made Bremont calibre.
Also in 7 collections
This watch appears in the Bremont Supermarine range (21), Stainless Steel Watches (3,546), Back in Stock (3,538), Automatic Watches (1,867), Sports Watches (860), Dive Watches (619) and Pre-Owned, Ex-Display & Vintage Watches (423).
What the specifications mean
A mechanical watch built to be worn hard and got wet.
Strengths
- 300m water resistance, rated for actual diving
- 40mm suits most wrists
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
- Second time zone for travelling
Bremont Supermarine Jet GMT alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification | S302-JET-R-S | 57289477 | R32128202 |
|---|---|---|---|
| Price | £2,650 | £2,950 | £2,700 |
| Case size | 40mm | 39mm | 43mm |
| Water resistance | 300m | 300m | 300m |
| Movement | Automatic | Automatic | Automatic |
| Strap | Rubber strap | Stainless steel bracelet | Ceramic bracelet |
| Power reserve | 50 hours | 72 hours | 80 hours |
| This watch | Closely matched |
|
Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Yes. At 300m it is rated for swimming, snorkelling and recreational diving.
Water resistance explainedWill the glass scratch?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
Sapphire, mineral and acrylic comparedDoes it need a battery?
No. It is automatic — the motion of your wrist winds it, and there is no cell to replace.
Quartz, automatic and solar comparedHow long does it run for when it's not worn?
About 50 hours fully wound — enough to survive a night off the wrist, but not a full weekend.
Is it a men's or women's watch?
Listed as men's, though at 40mm it sits in the range that suits anyone.
Cheapest place to buy
Mappin & Webb is the only UK retailer we track stocking this reference, so there is nothing to compare it against today.
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