Hamilton Intra-Matic Auto Chronograph vs Seiko Prospex "Turtle"
Hamilton's chronograph meets Seiko's diver
Quick Verdict
The Seiko Prospex "Turtle" ($500–$1,000) delivers In-House Automatic Manufacture technology in the tier below the Hamilton Intra-Matic Auto Chronograph ($2,500–$5,000). The Prospex "Turtle" measures 45mm and is rated 200m (20 ATM) Diver. The Intra-Matic Auto Chronograph justifies its premium with Swiss Made heritage and Automatic H-31. Both represent excellent choices in the luxury watch category.
Transparency — We earn a small commission on purchases made through our Amazon links. This doesn't affect our editorial independence.
Specifications Compared
| Feature | Hamilton Intra-Matic Auto Chronograph | Seiko Prospex "Turtle" |
|---|---|---|
| Price | $2,500–$5,000 | $500–$1,000 |
| Case Size | 40mm | 45mm |
| Movement | Automatic H-31 | Automatic Caliber 4R36 |
| Caliber Type | Valjoux-Based Automatic Chronograph | In-House Automatic Manufacture |
| Power Reserve | 60 Hours | 41 Hours |
| Water Resistance | 100m (10 ATM) | 200m (20 ATM) Diver |
| Crystal | Sapphire (Domed) | Sapphire Crystal |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Swiss Made | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Hamilton's design language vs Seiko's approach
The Hamilton Intra-Matic Auto Chronograph features a Stainless Steel case at 40mm with Sapphire (Domed) 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 H-31 vs Automatic Caliber 4R36
The Intra-Matic Auto Chronograph runs the Automatic H-31 (Valjoux-Based Automatic Chronograph, 60 Hours power reserve) at 28,800 vph (4 Hz) frequency. The Prospex "Turtle" uses the Automatic Caliber 4R36 (In-House Automatic Manufacture, 41 Hours reserve) at 21,600 vph (3 Hz). The Intra-Matic Auto Chronograph edges ahead on power reserve.
Wearability & Fit
40mm vs 45mm — different wrist presence
At 40mm, the Intra-Matic Auto Chronograph wears more compactly on smaller wrists compared to the Prospex "Turtle" at 45mm. Water resistance differs: 100m (10 ATM) vs 200m (20 ATM) Diver.
Value & Cost of Ownership
Seiko sits in the lower tier
The Hamilton Intra-Matic Auto Chronograph sits at $2,500–$5,000 and the Seiko Prospex "Turtle" at $500–$1,000. On the specs that outlast any price: the Intra-Matic Auto Chronograph uses Sapphire (Domed) with 60 Hours, against Sapphire Crystal and 41 Hours on the Prospex "Turtle". Service intervals are typically 5-7 years for both.
Water Resistance
100m (10 ATM) vs 200m (20 ATM) Diver
The Intra-Matic Auto Chronograph is rated to 100m (10 ATM) while the Prospex "Turtle" handles 200m (20 ATM) Diver. The Prospex "Turtle" offers superior water resistance.
Our Verdict
Hamilton
Intra-Matic Auto Chronograph
Choose the Hamilton Intra-Matic Auto Chronograph if you prioritize Valjoux-Based Automatic Chronograph engineering, Swiss Made craftsmanship, and 100m (10 ATM) water resistance. At $2,500–$5,000, it delivers Automatic H-31 with 60 Hours 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 Hamilton Intra-Matic Auto Chronograph and Seiko Prospex "Turtle" represent two distinct approaches to fine watchmaking — the Hamilton bringing Swiss Made tradition while Seiko delivers Made in Japan engineering.
Frequently Asked Questions
More Comparisons
Bulova Lunar Pilot vs Hamilton Intra-Matic Chrono
Moon-worn quartz precision meets Swiss automatic heritage
Seiko Prospex Turtle vs G-Shock CasiOak
Mechanical dive heritage vs digital indestructibility
Tag Heuer Carrera Chronograph vs Hamilton Intra-Matic Auto Chronograph
Two chronographs compared — $2,500–$5,000 vs $2,500–$5,000
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.