Invicta Pro Diver Automatic 23681 vs Seiko Prospex "Turtle"
Two divers compared — $50–$100 vs $500–$1,000
Quick Verdict
The Invicta Pro Diver Automatic 23681 ($50–$100) offers Automatic (Seiko NH35A) precision in the tier below the Seiko Prospex "Turtle" ($500–$1,000). The Pro Diver Automatic 23681 measures 40mm and is rated 200m. The Prospex "Turtle" counters with Made in Japan craftsmanship and 200m (20 ATM) Diver water resistance. Both are exceptional divers for their respective tiers.
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Specifications Compared
| Feature | Invicta Pro Diver Automatic 23681 | Seiko Prospex "Turtle" |
|---|---|---|
| Price | $50–$100 | $500–$1,000 |
| Case Size | 40mm | 45mm |
| Movement | Automatic NH35A | Automatic Caliber 4R36 |
| Caliber Type | Automatic (Seiko NH35A) | In-House Automatic Manufacture |
| Power Reserve | — | 41 Hours |
| Water Resistance | 200m | 200m (20 ATM) Diver |
| Crystal | Mineral Glass | Sapphire Crystal |
| Case Material | — | Stainless Steel |
| Origin | Invicta (Japanese movement) | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Invicta's design language vs Seiko's approach
The Invicta Pro Diver Automatic 23681 features a steel case at 40mm with Mineral Glass protection. The Seiko Prospex "Turtle" offers Stainless Steel construction at 45mm with Sapphire Crystal. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Automatic NH35A vs Automatic Caliber 4R36
The Pro Diver Automatic 23681 runs the Automatic NH35A (Automatic (Seiko NH35A), standard power reserve) at standard frequency. The Prospex "Turtle" uses the Automatic Caliber 4R36 (In-House Automatic Manufacture, 41 Hours reserve) at 21,600 vph (3 Hz). The Prospex "Turtle" offers a longer power reserve.
Wearability & Fit
40mm vs 45mm — different wrist presence
At 40mm, the Pro Diver Automatic 23681 wears more compactly on smaller wrists compared to the Prospex "Turtle" at 45mm. Water resistance differs: 200m vs 200m (20 ATM) Diver.
Value & Cost of Ownership
Invicta sits in the lower tier
The Invicta Pro Diver Automatic 23681 sits at $50–$100 and the Seiko Prospex "Turtle" at $500–$1,000. On the specs that outlast any price: the Pro Diver Automatic 23681 uses Mineral Glass with a standard reserve, against Sapphire Crystal and 41 Hours on the Prospex "Turtle". Service intervals are typically 5-7 years for both.
Water Resistance
200m vs 200m (20 ATM) Diver
The Pro Diver Automatic 23681 is rated to 200m while the Prospex "Turtle" handles 200m (20 ATM) Diver. Both offer identical water resistance ratings.
Our Verdict
Invicta
Pro Diver Automatic 23681
Choose the Invicta Pro Diver Automatic 23681 if you prioritize Automatic (Seiko NH35A) engineering, Invicta (Japanese movement) craftsmanship, and 200m water resistance. At $50–$100, it delivers Automatic NH35A with solid power reserve.
Check Price on AmazonSeiko
Prospex "Turtle"
Choose the Seiko Prospex "Turtle" if you value In-House Automatic Manufacture technology, Made in Japan heritage, and 45mm proportions. At $500–$1,000, the Automatic Caliber 4R36 with 41 Hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Invicta Pro Diver Automatic 23681 and Seiko Prospex "Turtle" represent two distinct approaches to the diver category — the Invicta bringing Invicta (Japanese movement) tradition while Seiko delivers Made in Japan engineering.
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.