Head-to-Head Comparison

Updated September 5, 2026

Casio Duro MDV106 Black vs Seiko Prospex Samurai SRPF03

Two divers compared — $50–$100 vs $250–$500

Quick Verdict

The Casio Duro MDV106 Black ($50–$100) offers Casio Quartz (Battery) precision in the tier below the Seiko Prospex Samurai SRPF03 ($250–$500). The Duro MDV106 Black measures 44mm and is rated 200m (20 ATM) Diver. The Prospex Samurai SRPF03 counters with Japanese Movement craftsmanship and 200m (20 ATM) water resistance. Both are exceptional divers for their respective tiers.

CasioDuro MDV106 Black$50–$100 Check price SeikoProspex Samurai SRPF03$250–$500 Check price

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Casio

Duro MDV106 Black

$50–$100

Check Price Full Review

Seiko

Prospex Samurai SRPF03

$250–$500

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Specifications Compared

Feature	Casio Duro MDV106 Black	Seiko Prospex Samurai SRPF03
Price	$50–$100	$250–$500
Case Size	44mm	43.8mm
Movement	Quartz Module 2784	Automatic Caliber 4R35
Caliber Type	Casio Quartz (Battery)	Seiko Automatic, hand-winding and hacking
Power Reserve	3-Year Battery	41 Hours
Water Resistance	200m (20 ATM) Diver	200m (20 ATM)
Crystal	Mineral Glass	Hardlex Crystal
Case Material	Stainless Steel	Stainless Steel
Origin	Casio (Japan)	Japanese Movement

Category-by-Category Analysis

🎨

Design & Aesthetics

Edge: Draw

Casio's design language vs Seiko's approach

The Casio Duro MDV106 Black features a Stainless Steel case at 44mm with Mineral Glass 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

Edge: Seiko

Quartz Module 2784 vs Automatic Caliber 4R35

The Duro MDV106 Black runs the Quartz Module 2784 (Casio Quartz (Battery), 3-Year Battery power reserve) at standard 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

Edge: Seiko

44mm vs 43.8mm — different wrist presence

At 44mm, the Duro MDV106 Black has a bolder wrist presence compared to the Prospex Samurai SRPF03 at 43.8mm. Water resistance differs: 200m (20 ATM) Diver vs 200m (20 ATM).

💰

Value & Cost of Ownership

Edge: Casio

Casio sits in the lower tier

The Casio Duro MDV106 Black sits at $50–$100 and the Seiko Prospex Samurai SRPF03 at $250–$500. On the specs that outlast any price: the Duro MDV106 Black uses Mineral Glass with 3-Year Battery, against Hardlex Crystal and 41 Hours on the Prospex Samurai SRPF03. Service intervals are typically 5-7 years for both.

💧

Water Resistance

Edge: Draw

200m (20 ATM) Diver vs 200m (20 ATM)

The Duro MDV106 Black is rated to 200m (20 ATM) Diver while the Prospex Samurai SRPF03 handles 200m (20 ATM). Both offer identical water resistance ratings.

Our Verdict

Casio

Duro MDV106 Black

Choose the Casio Duro MDV106 Black 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.

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Seiko

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.

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The Bottom Line

The Casio Duro MDV106 Black and Seiko Prospex Samurai SRPF03 represent two distinct approaches to the diver category — the Casio bringing Casio (Japan) tradition while Seiko delivers Japanese Movement engineering.

Frequently Asked Questions

The Seiko Prospex Samurai SRPF03 is the better buy if you want a mechanical movement; the Casio Duro MDV106 Black is the better buy if you want quartz accuracy with no servicing. On price, the Casio Duro MDV106 Black sits a band lower ($50–$100 against $250–$500), so it is the cheaper way into the category. Neither is better at everything; the spec table above shows movement, case size, water resistance and crystal side by side so you can weigh what matters to you. We do not test units, so this is the makers' data, not a bench result.

The Casio Duro MDV106 Black offers better upfront value, sitting a tier lower at $50–$100. However, the Seiko Prospex Samurai SRPF03 may justify its premium with superior finishing, heritage, or resale value.

Both are suitable for daily wear. The Duro MDV106 Black at 44mm with 200m (20 ATM) Diver water resistance handles everyday situations. The Prospex Samurai SRPF03 at 43.8mm with 200m (20 ATM) is similarly capable. The Duro MDV106 Black uses Mineral Glass while the Prospex Samurai SRPF03 uses Hardlex Crystal.

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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.