Seiko 5 Sports Field (39.4 mm)
The 39.4 mm field version of the 5 Sports on a nylon strap, with the 4R36 automatic, Hardlex and 100 m water resistance. Replaces the SNK809 with hacking and hand-winding.
Not in stock today (ships later) · sold by OutdoorEquipped. Price as of November 3, 2026, 18:15 UTC.
2 versions of the Seiko 5 Sports Field (39.4 mm)
Same case and movement, different dial, bezel or strap. Each line is its own Amazon listing with its own price today; the strap variants earn fewer spec points than the bracelet.
| Reference | Dial / strap | Strap | Spec pts | Price | Value Score | Sales rank | Buy |
|---|---|---|---|---|---|---|---|
SRPG37 | Black dial, nylon strap | Nylon | 65 | $252.00third-partyships later | 100 | #845 | Amazon |
 SRPH33 | Black dial, orange accents, nylon strap | Nylon | 65 | $280.00third-partyships later | 98 | #1,027 | Amazon |
Amazon.com prices as of November 3, 2026, 18:15 UTC — details.
What you get
Published manufacturer specifications. Fields we could not verify are left out rather than guessed.
How the 65 spec points add up
Value Score = 100 × √(spec points per dollar ÷ the best ratio among automatic sport watches in stock on Amazon today). Full methodology.
Compared with other automatic sport watches
Same type, other model families, verified Amazon prices today. See the full Automatic Sport & Everyday Watches ranking →
| # | Watch | Movement | Crystal | Water res. | Case diameter × lug-to-lug | Fits wrist | Spec pts | Price | Value Score | Buy |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | Automatic (8210) | Mineral | 50 m | 40 mm | — | 58 | $356.25 | 82 | Amazon |
| 2 | Automatic (Sistem51) | — | 30 m | 42 mm | — | 41 | $275.00 | 78 | Amazon | |
| 3 | Automatic (Miyota 821A) | Mineral | 100 m | 45 mm | — | 58 | $440.00 | 74 | Amazon | |
| 4 |  | Automatic (Powermatic 80) | Sapphire | 100 m | 35 × 39.5 mm | ≥ 14.2 cm (5.6″) | 76 | $795.00 | 63 | Amazon |
| 5 |  | Automatic (Powermatic 80) | Sapphire | 100 m | 40 × 44.5 mm | ≥ 16 cm (6.3″) | 76 | $850.00 | 61 | Amazon |
| 6 | | Automatic (4R36) | Hardlex | 100 m | 39.4 mm | — | 65 | $252.00third-partyships later | 100 | Amazon |
Amazon.com prices as of November 3, 2026, 18:15 UTC — details. third-party = sold by a marketplace seller, not Amazon (warranty may differ); ships later = not in stock today, never crowned best value.
Questions about the Seiko 5 Sports Field (39.4 mm)
How much does the Seiko 5 Sports Field (39.4 mm) cost on Amazon?
What is the Value Score of the Seiko 5 Sports Field (39.4 mm)?
What wrist size fits the Seiko 5 Sports Field (39.4 mm)?
What are alternatives to the Seiko 5 Sports Field (39.4 mm)?
20 mm straps that fit the Seiko 5 Sports Field (39.4 mm)
The lug width is 20 mm, so any 20 mm strap fits. These are the straps we list for that width; see the lug width chart for every size and the accessories page for winders, boxes and tools. Full picks with buying notes: Best 20 mm watch straps.
| Item | Kind | Lug width | Price | Buy |
|---|---|---|---|---|
 BISONSTRAP hand-stitched leather, quick release, 20 mm Entry-price leather with quick-release pins. | Leather strap | 20 mm | $14.99third-party | Amazon |
 Getalia Tuscany vegetable-tanned leather, 20 mm Full-grain Italian leather; ages with wear. | Leather strap | 20 mm | $24.99third-party | Amazon |
 Archer military-style nylon, 20 mm, black Heavy nylon with brushed hardware. | Nylon / NATO strap | 20 mm | $19.99third-party | Amazon |
 Archer military-style nylon, 20 mm, black/gray Heavy nylon with brushed hardware. | Nylon / NATO strap | 20 mm | $19.99third-party | Amazon |
 StrapHabit FKM rubber, quick release, 20 mm Fluororubber: no smell, no sweat marks; the diver upgrade. | Rubber strap | 20 mm | $38.95third-party | Amazon |
 WOCCI 316L steel bracelet, double-locking clasp, 20 mm Inexpensive solid steel bracelet. | Steel bracelet | 20 mm | $28.99third-party | Amazon |
 EACHE steel mesh bracelet, 20 mm Milanese mesh for dress and field watches. | Steel bracelet | 20 mm | $19.99third-party | Amazon |
Amazon.com prices as of November 3, 2026, 18:15 UTC — details. Accessories have no Value Score; they are listed for fit, not ranked.
Guides that apply to this watch
- Ranked among watches under $300
- What the water-resistance rating actually permits
- Sapphire vs Hardlex vs mineral: what the crystal changes
- Lug width and strap sizing
- Automatic vs solar vs quartz: accuracy and running cost
- Watch gift guide by budget and recipient
- Buying a watch on Amazon: sellers, warranty, returns