Auto diver comparison
Seiko Prospex Turtle SRPE99 vs Seiko Prospex Samurai SRPL51
Verdict. Today the Seiko Prospex Turtle SRPE99 (SRPE99) is the better value by our formula: Value Score 44 vs 42, with 81 spec points at $485.00. The other watch costs $9.00 less. Prices as of November 3, 2026, 18:15 UTC.
Side by side
Seiko Prospex Turtle SRPE99 vs Seiko Prospex Samurai SRPL51: specs and price
| Spec |  Seiko Prospex Turtle SRPE99 SRPE99 |  Seiko Prospex Samurai SRPL51 SRPL51 |
|---|---|---|
| Price on Amazon today | $485.00 | $476.00 |
| Value Score (within type) | 44 | 42 |
| Spec points | 81 | 72 |
| Spec points per $100 | 16.7 | 15.1 |
| Movement | Automatic (4R36) | Automatic (4R35) |
| Power reserve | 41 h | 41 h |
| Crystal | Hardlex | — |
| Water resistance | 200 m ISO | 200 m ISO |
| Screw-down crown | Yes | Yes |
| Case diameter | 45 mm | — |
| Lug-to-lug | 48 mm | — |
| Thickness | 13.4 mm | — |
| Lug width | 22 mm | 22 mm |
| Fits wrist from | ≥ 17.3 cm (6.8″) | — |
| Strap / bracelet | Steel | Steel |
| Made in | — | — |
| Amazon sales rank | #333 | #333 |
FAQ
Questions about the Seiko Prospex Turtle SRPE99 and the Seiko Prospex Samurai SRPL51
Which is cheaper on Amazon today?
As of November 3, 2026, 18:15 UTC, the Seiko Prospex Turtle SRPE99 (SRPE99) is $485.00 and the Seiko Prospex Samurai SRPL51 (SRPL51) is $476.00; the difference is $9.00. Amazon's price at checkout applies.
Context
Where both sit 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.