Casio Duro MDV106 vs Seiko Prospex "Turtle"
Two divers compared — $50–$100 vs $500–$1,000
Quick Verdict
The Casio Duro MDV106 ($50–$100) offers Casio Quartz (Battery) precision in the tier below the Seiko Prospex "Turtle" ($500–$1,000). The Duro MDV106 measures 44mm and is rated 200m (20 ATM) Diver. 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 | Casio Duro MDV106 | Seiko Prospex "Turtle" |
|---|---|---|
| Price | $50–$100 | $500–$1,000 |
| Case Size | 44mm | 45mm |
| Movement | Quartz Module 2784 | Automatic Caliber 4R36 |
| Caliber Type | Casio Quartz (Battery) | In-House Automatic Manufacture |
| Power Reserve | 3-Year Battery | 41 Hours |
| Water Resistance | 200m (20 ATM) Diver | 200m (20 ATM) Diver |
| Crystal | Mineral Glass | Sapphire Crystal |
| Case Material | Stainless Steel | Stainless Steel |
| Origin | Casio (Japan) | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Casio's design language vs Seiko's approach
The Casio Duro MDV106 features a Stainless Steel case at 44mm 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
Quartz Module 2784 vs Automatic Caliber 4R36
The Duro MDV106 runs the Quartz Module 2784 (Casio Quartz (Battery), 3-Year Battery 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
44mm vs 45mm — different wrist presence
At 44mm, the Duro MDV106 wears more compactly on smaller wrists compared to the Prospex "Turtle" at 45mm. Water resistance differs: 200m (20 ATM) Diver vs 200m (20 ATM) Diver.
Value & Cost of Ownership
Casio sits in the lower tier
The Casio Duro MDV106 sits at $50–$100 and the Seiko Prospex "Turtle" at $500–$1,000. On the specs that outlast any price: the Duro MDV106 uses Mineral Glass with 3-Year Battery, against Sapphire Crystal and 41 Hours on the Prospex "Turtle". Service intervals are typically 5-7 years for both.
Water Resistance
200m (20 ATM) Diver vs 200m (20 ATM) Diver
The Duro MDV106 is rated to 200m (20 ATM) Diver while the Prospex "Turtle" handles 200m (20 ATM) Diver. Both offer identical water resistance ratings.
Our Verdict
Casio
Duro MDV106
Choose the Casio Duro MDV106 if you prioritize Casio Quartz (Battery) engineering, Casio (Japan) craftsmanship, and 200m (20 ATM) Diver water resistance. At $50–$100, it delivers Quartz Module 2784 with 3-Year Battery 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 Casio Duro MDV106 and Seiko Prospex "Turtle" represent two distinct approaches to the diver category — the Casio bringing Casio (Japan) tradition while Seiko delivers Made in Japan engineering.
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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.