Seiko 5 Sports SRPD vs Orient Kamasu
Verdict. Today the Orient Kamasu (RA-AA0001B) is the better value by our formula: 32.9 vs 24.3 spec points per $100 (different types, so Value Scores are not compared), with 83 spec points at $252.60. The other watch costs $27.40 more. Prices as of November 3, 2026, 18:15 UTC.
Both are Japanese automatics at a similar price with dive-watch looks, but only one is a diver. The Orient Kamasu has a sapphire crystal, 200 m water resistance, a screw-down crown and the hacking, hand-winding F6922 calibre. The Seiko 5 Sports SRPD has a Hardlex crystal, 100 m, a push-pull crown and the 4R36, which also hacks and hand-winds. They are different types here (automatic diver vs automatic sport watch), so compare spec points and price rather than Value Scores. Today: SRPD $280.00, Kamasu $252.60.
Seiko 5 Sports SRPD (42.5 mm) vs Orient Kamasu: specs and price
| Spec |  Seiko 5 Sports SRPD (42.5 mm) SRPD55 · priced variant of 6 |  Orient Kamasu RA-AA0001B · priced variant of 3 |
|---|---|---|
| Price on Amazon today | $280.00 | $252.60 |
| Value Score (within type) | 100 | 61 |
| Spec points | 68 | 83 |
| Spec points per $100 | 24.3 | 32.9 |
| Type | Auto sport | Auto diver |
| Movement | Automatic (4R36) | Automatic (F6922) |
| Power reserve | 41 h | 40 h |
| Crystal | Hardlex | Sapphire |
| Water resistance | 100 m | 200 m |
| Screw-down crown | No | Yes |
| Case diameter | 42.5 mm | 41.8 mm |
| Lug-to-lug | 46 mm | 46.8 mm |
| Thickness | 13.4 mm | 12.8 mm |
| Lug width | 22 mm | 22 mm |
| Fits wrist from | ≥ 16.6 cm (6.5″) | ≥ 16.8 cm (6.6″) |
| Strap / bracelet | Steel | Steel |
| Made in | — | — |
| Amazon sales rank | #54 | #295 |
Choose the Seiko 5 Sports SRPD (42.5 mm) if…
- You want the widest choice of dials and straps: the SRPD line comes in dozens of colorways on a 22 mm lug.
- You will not swim with it beyond a pool: 100 m and a push-pull crown are fine for daily wear.
- You like the Seiko 5 heritage and the SKX silhouette in a 42.5 mm case.
Choose the Orient Kamasu if…
- You want hardware: sapphire, 200 m and a screw-down crown are the three specs the SRPD lacks, and they are why the Kamasu earns more spec points.
- You will actually swim or snorkel with it.
- You prefer a slightly smaller case: 41.8 mm with a 22 mm lug and a 120-click bezel.
Questions about the Seiko 5 Sports SRPD (42.5 mm) and the Orient Kamasu
Is the Seiko 5 Sports SRPD a dive watch?
Do both movements hack and hand-wind?
Which is the better value today?
Which is cheaper on Amazon today?
Where the Seiko 5 Sports SRPD (42.5 mm) sits among automatic sport watches
| # | Watch | Movement | Crystal | Water res. | Case diameter × lug-to-lug | Fits wrist | Spec pts | Price | Value Score | Buy |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | | Automatic (4R36) | Hardlex | 100 m | 42.5 × 46 mm | ≥ 16.6 cm (6.5″) | 68 | $280.00third-party | 100 | Amazon |
| 2 |  | Automatic (4R36) | Hardlex | 100 m | 40 × 44.6 mm | ≥ 16.1 cm (6.3″) | 68 | $306.00third-party | 96 | Amazon |
| 3 |  | Automatic (8210) | Mineral | 50 m | 40 mm | — | 58 | $356.25 | 82 | Amazon |
| 4 | Automatic (Sistem51) | — | 30 m | 42 mm | — | 41 | $275.00 | 78 | Amazon | |
| 5 | Automatic (Miyota 821A) | Mineral | 100 m | 45 mm | — | 58 | $440.00 | 74 | Amazon | |
| 6 |  | Automatic (Powermatic 80) | Sapphire | 100 m | 35 × 39.5 mm | ≥ 14.2 cm (5.6″) | 76 | $795.00 | 63 | Amazon |
| 7 |  | Automatic (Powermatic 80) | Sapphire | 100 m | 40 × 44.5 mm | ≥ 16 cm (6.3″) | 76 | $850.00 | 61 | Amazon |
| 8 |  | 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.
Where the Orient Kamasu sits among automatic dive watches
| # | Watch | Movement | Crystal | Water res. | Case diameter × lug-to-lug | Fits wrist | Spec pts | Price | Value Score | Buy |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | Automatic (Seiko NH35) | Mineral | 200 m | 40 × 48 mm | ≥ 17.3 cm (6.8″) | 77 | $88.00third-party | 100 | Amazon |
| 2 |  | Automatic (F6922) | Mineral | 200 m | 41.5 × 47 mm | ≥ 16.9 cm (6.7″) | 76 | $213.15third-party | 64 | Amazon |
| 3 |  | Automatic (F6922) | Mineral | 200 m | 41.5 × 47 mm | ≥ 16.9 cm (6.7″) | 76 | $225.20third-party | 62 | Amazon |
| 4 | | Automatic (F6922) | Sapphire | 200 m | 41.8 × 46.8 mm | ≥ 16.8 cm (6.6″) | 83 | $252.60third-party | 61 | Amazon |
| 5 |  | Automatic (F6922) | Sapphire | 200 m | 40 mm | — | 83 | $257.04third-party | 61 | Amazon |
| 6 | Automatic (4R36) | Hardlex | 200 m ISO | 45 × 48 mm | ≥ 17.3 cm (6.8″) | 81 | $485.00third-party | 44 | Amazon | |
| 7 | Automatic (4R35) | — | 200 m ISO | — | — | 72 | $476.00third-party | 42 | Amazon | |
| 8 |  | Automatic (Powermatic 80) | Sapphire | 300 m | 40 mm | — | 90 | $875.00 | 34 | Amazon |
| 9 | Automatic (H-10) | Sapphire | 100 m | 40 mm | — | 85 | $975.00 | 32 | 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.