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Invicta Pro Diver vs Seiko 5 Sports
A Seiko-made movement in two very different watches
Quick Verdict
The Invicta Pro Diver 8926OB ($50–$100) runs the Seiko NH35 in a 40mm steel case rated to 200m with mineral glass. The Seiko 5 Sports SRPD55 ($250–$500) runs the 4R36 in a 42.5mm case rated to 100m with Hardlex and a day-date. Both have 41-hour reserves. The Invicta is the cheaper and smaller watch; the Seiko is the brand-name original.
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Specifications Compared
| Feature | Invicta Pro Diver Automatic | Seiko 5 Sports 5KX |
|---|---|---|
| Price | $50–$100 | $250–$500 |
| Case Size | 40mm | 42.5mm |
| Movement | Automatic Seiko NH35 | Automatic Caliber 4R36 |
| Caliber Type | Seiko NH35 Automatic (Hacking, Hand-Winding) | Seiko In-House Automatic |
| Power Reserve | 41 Hours | 41 Hours |
| Water Resistance | 200m (20 ATM) | 100m (10 ATM) |
| Crystal | Mineral Glass | Hardlex Crystal |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Japanese Movement (Seiko NH35) | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Classic diver homage against Seiko sports design
The Invicta follows the classic steel diver template with a coin-edge bezel. The Seiko 5 Sports has its own sports-diver look and shows the day as well as the date.
Movement & Performance
NH35 against 4R36
The Invicta runs the Seiko NH35, 24 jewels at 21,600 vph, 41-hour reserve, hacking and hand-winding, with a date. The Seiko runs the 4R36, 24 jewels at 21,600 vph, 41-hour reserve, with a day-date. Both come from Seiko's movement family and have the same core specification.
Durability & Water Resistance
200m against 100m
The Invicta is rated to 200m (20 ATM) with mineral glass. The Seiko is rated to 100m (10 ATM) with Hardlex. Both are fine for swimming; the Invicta has the higher rating.
Wearability & Fit
The Invicta is 2.5mm smaller
The Invicta is 40mm and the Seiko is 42.5mm. The Invicta suits more wrists.
Value & Cost of Ownership
The Invicta is far cheaper
The Invicta sits in the $50–$100 band and the Seiko in $250–$500. With the same reserve and a higher water rating, the Invicta wins on value. The Seiko's argument is the brand and the day-date.
Our Verdict
Invicta
Pro Diver Automatic
Choose the Invicta Pro Diver if you want an automatic diver for the least money. You get a Seiko-made NH35, a 200m rating, an exhibition caseback and a 40mm case.
Check Price on AmazonSeiko
5 Sports 5KX
Choose the Seiko 5 Sports if you want a watch from Seiko itself, with a day-date and the 5 Sports styling. It costs more and is rated to 100m rather than 200m.
Check Price on AmazonThe Bottom Line
The Invicta Pro Diver 8926OB uses the Seiko NH35 automatic in a 40mm case rated to 200m in the $50 to $100 band, while the Seiko 5 Sports SRPD55 uses the Seiko 4R36 in a 42.5mm case rated to 100m in the $250 to $500 band; both movements have a 41-hour reserve.
Frequently Asked Questions
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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.