# Seiko 5 Sports Automatic Flieger Review by A.I. WatchMetrics

## Watch Summary
The Seiko 5 Sports Automatic Flieger (SRPG31K1) is a pilot-style field watch blending classic Type 1 Flieger aesthetics with modern wearability, boasting a compact 39.3mm stainless steel case, black dial with oversized Arabic numerals at 12-3-6-9, a railway minute track, and a convenient day-date window at 3 o'clock complemented by Lumibrite-filled hands and markers for low-light legibility. Tailored for the budget-conscious enthusiast or daily wearer who appreciates aviation heritage without excess, it stands out with 100m water resistance on a leather strap and the robust in-house 4R36 automatic movement delivering approximately 41 hours of power reserve, hacking seconds, and hand-winding.

## Overall Watch Rating: 6.5/10.0

**Movement Metric (8.6/10.0)** - The in-house 4R36 automatic offers reliable performance with hacking and robust build quality comparable to ETA 2824-2 clones in entry-level Swiss watches.
**Dials & Design Metric (8.5/10.0)** - Timeless Flieger-inspired layout with superb legibility and balanced proportions echoes vintage Laco Type A pilots.
**Versatility Metric (8.5/10.0)** - Excels across casual, sports, adventure, and pilot scenarios, much like a versatile Hamilton Khaki Field.
**Material Metric (8.3/10.0)** - Stainless steel case paired with durable Hardlex crystal delivers solid resilience akin to mid-tier Oris field watches.
**History & Innovation Metric (7.2/10.0)** - Leverages Seiko's pioneering automatic heritage in an established homage design without radical new tech.
**Complications Metric (6.3/10.0)** - Practical day-date adds everyday utility on par with classic military tool watches.
**Brand Metric (5.3/10.0)** - Seiko's mid-tier dependability provides strong value similar to Citizen or Hamilton equivalents.
**Functions Metric (2.7/10.0)** - Essential time, day, and date suffice for basics but trail multifunction competitors.
**Rarity Metric (2.7/10.0)** - Mass-produced accessibility at sub-$400 pricing lacks the scarcity of limited-run microbrands.

## Total Performance Score (TPS): 4.1

## WM Collector Grade: B-

## Performance Insights: Exceptional movement, dials, versatility, and materials drive high scores, offset by modest functions and rarity, delivering solid value well under its $425 implied price.

## TPS Interpretation: Fair Value: The watch overdelivers on design and build quality for an entry-level automatic pilot homage.

## Watch Data
[https://www.seikowatches.com/us-en/-/media/project/seiko/seiko/case-studies/5-sports/srpg31/srpg31k1_main.png?h=533&w=533&la=en] - https://www.seikowatches.com/us-en/-/media/project/seiko/seiko/case-studies/5-sports/srpg31/srpg31k1_main.png?h=533&w=533&la=en; [https://www.seikowatches.com/us-en/-/media/project/seiko/seiko/case-studies/5-sports/srpg31/srpg31k1_back.png] - https://www.seikowatches.com/us-en/-/media/project/seiko/seiko/case-studies/5-sports/srpg31/srpg31k1_back.png; [https://www.ablogtowatch.com/wp-content/uploads/2021/10/Seiko-5-Sports-SRPG31K1-Flieger-lume.jpg] - https://www.ablogtowatch.com/wp-content/uploads/2021/10/Seiko-5-Sports-SRPG31K1-Flieger-lume.jpg; [Nickname] - Seiko 5 Sports Flieger; [Brand] - Seiko; [Model] - 5 Sports SRPG31K1; [Country] - Japan; [Product Link] - https://www.seikowatches.com/us-en/5sports/srpg31k1; [reviewLink] - -; [Movement Type] - Automatic; [Movement Name] - 4R36; [# Secondary] - 0; [watchDescription] - Compact 39.3mm stainless steel pilot watch with black Flieger dial, Arabic numerals, Lumibrite, day-date at 3, leather strap, 100m WR, and automatic movement; [caseWidth] - 39.3; [lugToLugLength] - 47.2; [thickness] - 12.3; [lug] - 20; [waterResist] - 100; [powerReserve] - 41; [beatFrequency] - 21600; [lume] - Lumibrite; [jewels] - 24; [caseMaterial] - Stainless steel; [watchGlass] - Hardlex; [Bezel] - Fixed coin-edge; [caseback] - Screw-down exhibition; [Crown] - Push-pull; [Strap] - Calf leather; [Shape] - Round; [Dial] - Black; [Seconds] - Yes; [Date] - Yes; [Calendar] - No; [Chiming] - No; [Chronograph] - No; [Compass] - No; [dateCompilation] - Yes; [DigitalDisplay] - No; [Dress] - No; [Field] - Yes; [GMT] - No; [Mechanical Alarm] - No; [Moonphase] - No; [Tourbillon] - No; [worldTimer] - No; [powerReserveIndicator] - No; [Diver] - No; [Pilot] - Yes; [racing] - No; [Skeleton] - No; [Vintage] - No; [StyleFormal] - No; [StyleCasual] - Yes; [StyleSports] - Yes; [StyleTravel] - Yes; [StyleAdventure] - Yes; [StyleCollector] - Yes; [StyleTool] - Yes; [StyleStatement] - No; [StyleVintage] - No; [StyleSmart] - No; [StyleCustom] - No; [TPS_new] - 4.1; [TPSgrade] - B-; [TPSimpliedPrice] - 425;

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