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

## Watch Summary
The Seiko 5 Field Sports is a rugged field watch from Seiko's accessible 5 Sports collection, featuring a 39.4mm stainless steel case with brushed finishing, a textured black dial accented by bold Arabic numerals and Lumibrite lume for superior low-light readability, day-date complication at 3 o'clock, and a military-inspired design paired with a comfortable canvas strap, powered by the automatic Caliber 4R36 movement offering about 41 hours of power reserve—perfect for active adventurers and daily wearers seeking reliable, no-nonsense tool watch performance at an entry price point.

## Overall Watch Rating: 6.7/10.0

**Versatility Metric (8.8/10.0)** - Seamlessly shifts from trail adventures to urban casual, surpassing many single-purpose tool watches in broad appeal.
**Material Metric (8.7/10.0)** - Stainless steel case and Hardlex crystal deliver robust protection comparable to Hamilton Khaki Field models.
**Dials & Design Metric (8.3/10.0)** - Crisp field layout with excellent legibility echoes the timeless appeal of classic MIL-SPEC designs like the Marathon JSAR.
**History & Innovation Metric (8.0/10.0)** - Draws from Seiko 5's 1960s heritage of affordable automatics with day-date innovation still relevant today.
**Movement Metric (7.4/10.0)** - The 4R36 provides dependable hacking, winding, and accuracy akin to Sellita SW200 alternatives.
**Complications Metric (6.3/10.0)** - Practical day-date adds weekday tracking without clutter, on par with entry-level autos.
**Functions Metric (5.5/10.0)** - Solid timekeeping with day/date covers essentials but trails multifunction competitors.
**Brand Metric (5.3/10.0)** - Embodies Seiko's mid-tier reliability matching Citizen and Orient in consistent delivery.
**Rarity Metric (2.4/10.0)** - Common production and pricing align with other accessible fields like Casio and Timex offerings.

## Total Performance Score (TPS): 4.5

## WM Collector Grade: C+

## Performance Insights: Excels in versatility, materials, and design for everyday rugged use, though limited rarity and functions temper scores; strong value versus $15,000 implied price.
## TPS Interpretation: Modest Value: Delivers dependable field watch utility and aesthetics adequately aligned with its affordable positioning.

## Watch Data
[https://www.seikowatches.com/content/dam/seiko/us/en/product_images/seiko_5_sports/field/srpg31k1/SRPG31K1.png] - front; [https://www.seikowatches.com/content/dam/seiko/us/en/product_images/seiko_5_sports/field/srpg31k1/SRPG31K1_back.png] - back; [https://www.ablogtowatch.com/lib/images/Seiko%205%20Sports%20Field%20SRPG31%20lume.jpg] - lume; [Seiko 5 Field Sports] - Seiko 5 Field Sports; [Seiko] - Seiko; [5 Sports SRPG31K1] - 5 Sports SRPG31K1; [Japan] - Japan; [https://www.seikowatches.com/us-en/seiko5sports/srpg31k1] - https://www.seikowatches.com/us-en/seiko5sports/srpg31k1; [n/a] - n/a; [Mechanical Automatic] - Mechanical Automatic; [Caliber 4R36] - Caliber 4R36; [2] - 2; [Rugged 39.4mm field watch with black textured dial, Arabic numerals, canvas strap, day-date, and 100m water resistance for outdoor reliability.] - Rugged 39.4mm field watch with black textured dial, Arabic numerals, canvas strap, day-date, and 100m water resistance for outdoor reliability.; [39.4] - 39.4; [48.2] - 48.2; [11.5] - 11.5; [20] - 20; [100] - 100; [41] - 41; [21600] - 21600; [Lumibrite] - Lumibrite; [24] - 24; [stainless steel] - stainless steel; [Hardlex] - Hardlex; [fixed] - fixed; [solid screw-down] - solid screw-down; [knurled push-pull] - knurled push-pull; [canvas nylon] - canvas nylon; [round] - round; [black textured] - black textured; [yes] - yes; [yes] - yes; [no] - no; [no] - no; [no] - no; [no] - no; [no] - no; [no] - no; [no] - no; [no] - no; [no] - no; [yes] - yes; [no] - no; [no] - no; [no] - no; [no] - no; [no] - no; [no] - no; [no] - no; [no] - no; [no] - no; [yes] - yes; [yes] - yes; [yes] - yes; [no] - no; [yes] - yes; [no] - no; [yes] - yes; [no] - no; [no] - no; [no] - no; [no] - no; [no] - no; [4.5] - 4.5; [C+] - C+; [15000] - 15000;

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