# Seiko 5 Sports Professional Review by A.I. WatchMetrics

## Watch Summary
The Seiko 5 Sports Professional is a value-driven dive watch blending sporty aesthetics with practical reliability, boasting a 42.5mm stainless steel case, unidirectional rotating bezel, legible black dial with Lumibrite lume, and the in-house automatic 4R36 movement offering about 41 hours of power reserve—perfect for budget-minded adventurers, daily drivers, and entry-level divers seeking robust performance without luxury pricing.

## Overall Watch Rating: 6.7/10.0

**Cohesiveness Metric (9.5/10.0)** - As a standalone icon of the Seiko 5 Sports line, it delivers unified sporty design and function without any collection-level discrepancies.

**Versatility Metric (8.6/10.0)** - This diver excels across casual, sports, and adventure scenarios much like a more affordable Tudor Pelagos.

**History & Innovation Metric (7.8/10.0)** - Seiko's pioneering Seiko 5 heritage since 1963 anchors strong historical appeal, though innovation here sticks to proven formulas.

**Material Metric (7.9/10.0)** - Stainless steel case and Hardlex crystal provide solid durability comparable to entry Oris divers.

**Dials & Design Metric (7.7/10.0)** - Bold, legible dial with excellent lume and classic diver cues rivals the aesthetics of SevenFriday at a fraction of the cost.

**Movement Metric (7.1/10.0)** - The 4R36 automatic offers reliable in-house performance on par with Sellita SW200 basics but adds day-date utility.

**Complications Metric (6.4/10.0)** - Practical day and date displays match the utility of simple ETA 2824-powered tool watches.

**Brand Metric (5.3/10.0)** - Seiko upholds dependable mid-tier craftsmanship akin to Hamilton or Citizen for everyday enthusiasts.

**Functions Metric (3.8/10.0)** - Basic time-plus-day-date functionality falls short of multifunction peers like Omega Seamaster divers.

**Rarity Metric (2.9/10.0)** - Widely available at $350-$450, it mirrors the market saturation of most accessible automatics like Tissot Seastars.

## Total Performance Score (TPS): 9.5

## WM Collector Grade: A+

## Performance Insights: Excels in versatility, materials, design, and brand heritage while functions and rarity trail, delivering superior value far exceeding its modest price point.

## TPS Interpretation: Exceptional Value: This watch punches way above its weight with professional-grade dive capabilities and timeless styling at entry-level pricing.

## Watch Data
[Picture URL] - https://www.seikowatches.com/content/dam/global-01/seiko/cl/5sports/srpd55k1/srpd55k1_01.jpg; [backPicture] - https://www.seikowatches.com/content/dam/global-01/seiko/cl/5sports/srpd55k1/srpd55k1_03.jpg; [lumePicture] - https://www.ablogtowatch.com/wp-content/uploads/2021/06/seiko-5-sports-srpd55-lume.jpg; [Nickname] - Seiko 5 Sports Diver; [Brand] - Seiko; [Model] - 5 Sports SRPD55K1; [Country] - Japan; [Product Link] - https://www.seikowatches.com/global-en/products/seiko5sports/srpd55k1; [reviewLink] - https://www.hodinkee.com/articles/seiko-5-sports; [Movement Type] - Automatic; [Movement Name] - 4R36; [# Secondary] - 0; [watchDescription] - Affordable automatic dive watch with day-date and 100m water resistance; [caseWidth] - 42.5; [lugToLugLength] - 46.4; [thickness] - 13.4; [lug] - 22; [waterResist] - 100; [powerReserve] - 41; [beatFrequency] - 21600; [lume] - Lumibrite; [jewels] - 24; [caseMaterial] - Stainless steel; [watchGlass] - Hardlex; [Bezel] - Unidirectional rotating with aluminum insert; [caseback] - Transparent screw-down; [Crown] - Screw-down; [Strap] - Stainless steel bracelet; [Shape] - Round; [Dial] - Black; [Seconds] - yes; [Date] - yes; [Calendar] - no; [Chiming] - no; [Chronograph] - no; [Compass] - no; [dateCompilation] - no; [DigitalDisplay] - no; [Dress] - no; [Field] - no; [GMT] - no; [Mechanical Alarm] - no; [Moonphase] - no; [Tourbillon] - no; [worldTimer] - no; [powerReserveIndicator] - no; [Diver] - yes; [Pilot] - no; [racing] - no; [Skeleton] - no; [Vintage] - no; [StyleFormal] - no; [StyleCasual] - yes; [StyleSports] - yes; [StyleTravel] - no; [StyleAdventure] - yes; [StyleCollector] - yes; [StyleTool] - yes; [StyleStatement] - no; [StyleVintage] - no; [StyleSmart] - no; [StyleCustom] - no; [TPS_new] - 9.5; [TPSgrade] - A+; [TPSimpliedPrice] - 185;

**A.I. WatchMetrics Review v37.4 Grok 4 Fast. December 19, 2025.**