# Bremont Supermarine S300 Review by A.I. WatchMetrics


## Watch Summary
The Bremont Supermarine S300 is a robust professional dive watch blending British aviation heritage with tool-watch functionality, featuring a 42mm stainless steel case, unidirectional ceramic bezel, sapphire crystal with AR coating, 300m water resistance, and a modified Sellita SW200-1 automatic movement offering 38 hours of power reserve and a date complication, ideal for adventure seekers and collectors who value durable, legible dive aesthetics with subtle brand-specific design cues.

## Overall Watch Rating: 7.2/10.0

**Material Metric (9.0/10.0)** - Exceptional material choices like 316L stainless steel, AR-coated sapphire, and ceramic bezel rival those in higher-end divers from Omega or Tudor.
**Rarity Metric (6.5/10.0)** - At around $5,000 retail, it offers mid-tier exclusivity comparable to other premium tool watches without limited production hype.
**Brand Metric (6.5/10.0)** - Bremont holds strong high-premium status like Sinn or Christopher Ward, enhanced by enthusiast following and aviation prestige.
**Dials & Design Metric (7.5/10.0)** - Clean, legible dive dial with strong lume and balanced proportions stands out against average Seiko Prospex models.
**Versatility Metric (7.2/10.0)** - Excels as a sports/adventure tool watch for daily wear or diving, more adaptable than pure pilot chronos but less formal than integrated sports watches.
**History & Innovation Metric (6.6/10.0)** - Solid aviation legacy via Supermarine naming and anti-shock modifications edges above standard ETA-based divers.
**Movement Metric (6.5/10.0)** - Reliable modified Sellita SW200-1 provides good performance akin to ETA 2824 in mid-tier Hamilton or Oris pieces.
**Functions Metric (4.8/10.0)** - Basic time and date functions meet everyday needs but lag behind GMT or chronograph-equipped competitors.
**Complications Metric (4.0/10.0)** - Simple date adds minor utility, on par with entry-level automatics but far from true complications like annual calendars.

## Total Performance Score (TPS): 9.9
## TPS Interpretation: Excellent Value: The Supermarine S300 overdelivers on premium materials and dive capability well beyond expectations for its price bracket.
## WM Collector Grade: A+
## Performance Insights: Materials and design shine brightest, delivering robust tool-watch performance at a price implying far less value than this Bremont provides.

## Watch Data
[Picture URL] - https://us.bremont.com/cdn/shop/files/Supermarine_S300_White_1_1800x1800.jpg; [backPicture] - https://us.bremont.com/cdn/shop/files/Supermarine_S300_back.jpg; [lumePicture] - https://www.bremont.com/media/catalog/product/cache/1/image/9df78eab33525d08d6e5fb8d27136e95/s/u/supermarine_s300_lume.jpg; [Nickname] - Supermarine S300; [Brand] - Bremont; [Model] - Supermarine S300; [Country] - UK; [Product Link] - https://us.bremont.com/collections/supermarine/products/supermarine-s300-white; [reviewLink] - ; [Movement Type] - Mechanical; [Movement Name] - SHC03; [# MSRP] - 4995; [# Secondary] - 3600; [# Production] - Unlimited; [watchDescription] - Professional 300m dive watch with ceramic bezel, modified automatic movement, and aviation-inspired design; [caseWidth] - 42; [lugToLugLength] - 49.2; [thickness] - 12.6; [lug] - 22; [waterResist] - 300; [powerReserve] - 38; [beatFrequency] - 28800; [lume] - Super-LumiNova; [jewels] - 26; [caseMaterial] - 316L Stainless Steel; [watchGlass] - Sapphire AR; [Bezel] - Ceramic Unidirectional; [caseback] - Stainless Steel Exhibition; [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] - 0; [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] - 0; [StyleAdventure] - 1; [StyleCollector] - 1; [StyleTool] - 1; [StyleStatement] - 0; [StyleVintage] - 0; [StyleSmart] - 0; [StyleCustom] - 0; [TPS_new] - 9.9; [TPSgrade] - A+; [TPSimpliedPrice] - 1850;

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