Orient Kamasu Automatic Diver vs Seiko Prospex Samurai SRPF03
Two divers compared — $250–$500 vs $250–$500
Quick Verdict
The Orient Kamasu Automatic Diver ($250–$500) and Seiko Prospex Samurai SRPF03 ($250–$500) are closely matched divers at similar price points. The Kamasu Automatic Diver emphasizes Orient In-House Automatic engineering while the Prospex Samurai SRPF03 focuses on Japanese Movement craftsmanship.
Transparency — We earn a small commission on purchases made through our Amazon links. This doesn't affect our editorial independence.
Specifications Compared
| Feature | Orient Kamasu Automatic Diver | Seiko Prospex Samurai SRPF03 |
|---|---|---|
| Price | $250–$500 | $250–$500 |
| Case Size | 41.8mm | 43.8mm |
| Movement | Automatic Caliber F6922 | Automatic Caliber 4R35 |
| Caliber Type | Orient In-House Automatic | Seiko Automatic, hand-winding and hacking |
| Power Reserve | 40 Hours | 41 Hours |
| Water Resistance | 200m (20 ATM) | 200m (20 ATM) |
| Crystal | Sapphire Crystal | Hardlex Crystal |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Made in Japan | Japanese Movement |
Category-by-Category Analysis
Design & Aesthetics
Orient's design language vs Seiko's approach
The Orient Kamasu Automatic Diver features a Stainless Steel case at 41.8mm with Sapphire Crystal protection. The Seiko Prospex Samurai SRPF03 offers Stainless Steel construction at 43.8mm with Hardlex Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic Caliber F6922 vs Automatic Caliber 4R35
The Kamasu Automatic Diver runs the Automatic Caliber F6922 (Orient In-House Automatic, 40 Hours power reserve) at 21,600 vph (3 Hz) frequency. The Prospex Samurai SRPF03 uses the Automatic Caliber 4R35 (Seiko Automatic, hand-winding and hacking, 41 Hours reserve) at 21,600 vph (3 Hz). The Prospex Samurai SRPF03 offers a longer power reserve.
Wearability & Fit
41.8mm vs 43.8mm — different wrist presence
At 41.8mm, the Kamasu Automatic Diver wears more compactly on smaller wrists compared to the Prospex Samurai SRPF03 at 43.8mm. Water resistance differs: 200m (20 ATM) vs 200m (20 ATM).
Value & Cost of Ownership
Same tier — different value propositions
The Orient Kamasu Automatic Diver sits at $250–$500 and the Seiko Prospex Samurai SRPF03 at $250–$500. On the specs that outlast any price: the Kamasu Automatic Diver uses Sapphire Crystal with 40 Hours, against Hardlex Crystal and 41 Hours on the Prospex Samurai SRPF03. Service intervals are typically 5-7 years for both.
Water Resistance
200m (20 ATM) vs 200m (20 ATM)
The Kamasu Automatic Diver is rated to 200m (20 ATM) while the Prospex Samurai SRPF03 handles 200m (20 ATM). Both offer identical water resistance ratings.
Our Verdict
Orient
Kamasu Automatic Diver
Choose the Orient Kamasu Automatic Diver if you prioritize Orient In-House Automatic engineering, Made in Japan craftsmanship, and 200m (20 ATM) water resistance. At $250–$500, it delivers Automatic Caliber F6922 with 40 Hours power reserve.
Check Price on AmazonSeiko
Prospex Samurai SRPF03
Choose the Seiko Prospex Samurai SRPF03 if you value Seiko Automatic, hand-winding and hacking technology, Japanese Movement heritage, and 43.8mm proportions. At $250–$500, the Automatic Caliber 4R35 with 41 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Orient Kamasu Automatic Diver and Seiko Prospex Samurai SRPF03 represent two distinct approaches to the diver category — the Orient bringing Made in Japan tradition while Seiko delivers Japanese Movement engineering.
Frequently Asked Questions
More Comparisons
Tag Heuer Carrera Chronograph vs Orient Kamasu Automatic Diver
Tag Heuer's chronograph meets Orient's diver
Tag Heuer Carrera Chronograph vs Seiko Prospex Samurai SRPF03
Tag Heuer's chronograph meets Seiko's diver
Tissot PRX Powermatic 80 vs Orient Kamasu Automatic Diver
Tissot's timepiece meets Orient's diver
Explore These Watches
How This Page Was Made
Our comparisons are generated from a hand-maintained specification database and reviewed under our editorial standards. We use AI tools to assemble pages from that data. We don’t invent specs: every number traces back to the database, and when we correct an entry, the fix is applied site-wide. As an Amazon Associate, The Horologist earns from qualifying purchases.