# Bremont Supermarine S302 GMT Review by A.I. WatchMetrics

## Watch Summary
The Bremont Supermarine S302 GMT is a robust tool watch blending diver and travel styles, characterized by its aviation-inspired Trip-Tick case design, sword hands, and ceramic GMT bezel for tracking multiple time zones; it targets adventure-oriented collectors and professionals needing a durable 500m water-resistant GMT with automatic BE-3051 movement offering 42 hours of power reserve.

## Overall Watch Rating: 7.7/10.0

**Versatility Metric (8.9/10.0)** - Exceptional as a do-it-all diver-GMT for sports, travel, and daily wear, surpassing typical single-purpose tool watches like the Seiko Prospex.
**Dials & Design Metric (8.7/10.0)** - Striking legibility with Super-LumiNova indices and unique Bremont sword hands elevates it above standard divers like the Citizen Promaster.
**Material Metric (9.1/10.0)** - Premium 316L stainless steel, sapphire AR crystal, and ceramic bezel deliver top-tier durability comparable to Omega Seamaster components.
**Movement Metric (8.2/10.0)** - The modified Sellita BE-3051 provides reliable GMT performance and COSC-level accuracy, better than stock ETA in mid-tier Hamiltons.
**Brand Metric (7.1/10.0)** - Bremont offers accessible luxury craftsmanship with British heritage, on par with Oris or Sinn in the high-premium segment.
**Functions Metric (7.0/10.0)** - Solid time, date, and true GMT functionality meet expectations for a traveler's tool, akin to the Tissot PRX chronos.
**Complications Metric (6.8/10.0)** - The office-style GMT with date adds practical utility, matching entry-level GMTs from Longines.
**History & Innovation Metric (6.9/10.0)** - Strong aviation legacy via Supermarine ties provides established appeal, similar to IWC pilot heritage without groundbreaking novelties.
**Rarity Metric (6.6/10.0)** - Moderately exclusive at its price point with unlimited production, comparable to Tudor Black Bay models on the secondary market.

## Total Performance Score (TPS): 4.0
## TPS Interpretation: Fair Value: The watch delivers strong materials and versatility but standard functions relative to its premium pricing.
## WM Collector Grade: C
## Performance Insights: Excels in material quality, design, and multi-scenario versatility while brand and complications provide solid support, offering good tool-watch value slightly below implied price expectations around $5,500.

## Watch Data
[Picture URL] - https://bremont.com/cdn/shop/files/S302-GM-BK_1200x.jpg?v=1690586895; [backPicture] - https://bremont.com/cdn/shop/files/S302-GM-BK_back_1200x.jpg?v=1690586895; [lumePicture] - https://bremont.com/cdn/shop/files/S302-GM-BK_lume.jpg?v=1690586895; [Nickname] - Supermarine GMT Tool Diver; [Brand] - Bremont; [Model] - Supermarine S302 GMT; [Country] - UK; [Product Link] - https://bremont.com/products/supermarine-s302-gmt-black; [reviewLink] - https://www.hodinkee.com/articles/hands-on-bremont-supermarine-s302-gmt; [Movement Type] - Automatic; [Movement Name] - BE-3051; [# MSRP] - 5495; [# Secondary] - 4200; [# Production] - Unlimited; [watchDescription] - Professional 500m dive watch with true GMT, ceramic bezel, and aviation-inspired design; [caseWidth] - 42; [lugToLugLength] - 49.5; [thickness] - 12.8; [lug] - 22; [waterResist] - 500; [powerReserve] - 42; [beatFrequency] - 28800; [lume] - Super-LumiNova; [jewels] - 25; [caseMaterial] - 316L Stainless Steel; [watchGlass] - Sapphire AR; [Bezel] - Ceramic 24hr Unidirectional; [caseback] - Stainless Steel Screw-Down; [Crown] - Screw-Down; [Strap] - Rubber; [Shape] - Round; [Dial] - Black Indices; [caseShape] - Round; [Seconds] - 1; [Date] - 1; [Calendar] - 0; [Chiming] - 0; [Chronograph] - 0; [Compass] - 0; [dateCompilation] - 0; [DigitalDisplay] - 0; [Dress] - 0; [Field] - 0; [GMT] - 1; [Mechanical Alarm] - 0; [Moonphase] - 0; [Tourbillon] - 0; [worldTimer] - 0; [powerReserveIndicator] - 0; [Diver] - 1; [Pilot] - 0; [racing] - 0; [Skeleton] - 0; [Vintage] - 0; [StyleFormal] - 0; [StyleCasual] - 1; [StyleSports] - 1; [StyleTravel] - 1; [StyleAdventure] - 1; [StyleCollector] - 1; [StyleTool] - 1; [StyleStatement] - 0; [StyleVintage] - 0; [StyleSmart] - 0; [StyleCustom] - 0; [TPS_new] - 4.0; [TPSgrade] - C; [TPSimpliedPrice] - 5500;

**A.I. WatchMetrics Review v37.10 Grok 4 Fast. December 21, 2025.**