# Spinnaker Bradner GMT Review by A.I. WatchMetrics

## Watch Summary
The Spinnaker Bradner GMT is a compact, robust tool watch merging classic diver proportions with traveler GMT utility, featuring a 40mm stainless steel case, bi-directional ceramic GMT bezel, highly legible sunburst dial with strong C3 lume, and a workhorse Sellita SW330-2 automatic movement delivering 42 hours of power reserve�ideal for active collectors seeking affordable, no-nonsense global timekeeping at 200m water resistance.

## Overall Watch Rating: 6.4/10.0

**Brand Metric (6.2/10.0)** - Spinnaker holds strong as an enthusiast microbrand crafting reliable tool watches, on par with Baltic or Nivada Grenchen in the accessible premium space.

**History & Innovation Metric (3.2/10.0)** - As a relatively young brand, Spinnaker relies on established GMT tech without pioneering contributions, aligning with typical microbrand profiles like Halios.

**Rarity Metric (3.5/10.0)** - With unlimited production and a mid-range price, it mirrors the accessibility of standard Seiko or Citizen Prospex models.

**Material Metric (9.0/10.0)** - Stainless steel 316L case, double-domed sapphire with AR coating, and ceramic bezel provide top-tier durability comparable to Oris or Tudor divers.

**Movement Metric (8.2/10.0)** - The Sellita SW330-2 Elabor� offers smooth GMT operation, solid accuracy, and refined finishing that surpasses many in-house automatics like the Seiko NH34.

**Complications Metric (6.5/10.0)** - The traveler GMT with quick-set date delivers practical added utility, benchmarked against entry GMTs from Glycine or Mido.

**Functions Metric (6.0/10.0)** - Reliable hours, minutes, sweeping seconds, independent 24-hour hand, and magnified date handle daily needs like a Tissot Seastar GMT.

**Dials & Design Metric (7.8/10.0)** - Bold indices, textured sunburst dial, and purposeful GMT bezel markings create an engaging, highly legible aesthetic akin to modern Nomos Club Campus vibes in tool form.

**Versatility Metric (7.5/10.0)** - Suits casual office, sports outings, travel adventures, and light diving with its slim profile and dual-time prowess, much like a downsized Longines Spirit GMT.

## Total Performance Score (TPS): 4.0
## TPS Interpretation: Fair Value: Exceptional materials and movement quality outweigh modest heritage, offering strong performance for the sub-$700 segment.

## WM Collector Grade: B
## Performance Insights: Material excellence and movement refinement drive value, with GMT versatility adding appeal, outperforming expectations versus its $850 implied price.

## Watch Data
[Picture URL] - https://spinnaker-watches.com/cdn/shop/files/SPB213_001_1200x.png?v=1711923456; [backPicture] - https://spinnaker-watches.com/cdn/shop/files/SPB213_back_1200x.png?v=1711923456; [lumePicture] - ; [Nickname] - Bradner GMT; [Brand] - Spinnaker; [Model] - Bradner GMT; [Country] - Hong Kong; [Product Link] - https://spinnaker-watches.com/products/bradner-gmt-spb213; [reviewLink] - ; [Movement Type] - Automatic; [Movement Name] - Sellita SW330-2 Elabor�; [# MSRP] - 629; [# Secondary] - 520; [# Production] - Unlimited; [watchDescription] - Affordable GMT tool watch with diver specs, ceramic bezel, and Sellita movement; [caseWidth] - 40; [lugToLugLength] - 48; [thickness] - 12.8; [lug] - 20; [waterResist] - 200; [powerReserve] - 42; [beatFrequency] - 28800; [lume] - Super-LumiNova C3; [jewels] - 25; [caseMaterial] - Stainless Steel 316L; [watchGlass] - Sapphire AR; [Bezel] - Bi-directional GMT ceramic; [caseback] - Solid screw-down; [Crown] - Screw-down; [Strap] - FKM rubber; [Shape] - Round; [Dial] - Sunburst; [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] - B; [TPSimpliedPrice] - 850;

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