Head-to-Head Comparison

Updated September 5, 2026

Casio Duro MDV106 Black vs Citizen Promaster Sea Eco-Drive Diver

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 Citizen Promaster Sea Eco-Drive Diver ($250–$500). The Duro MDV106 Black measures 44mm and is rated 200m (20 ATM) Diver. The Promaster Sea Eco-Drive Diver counters with Made in Japan craftsmanship and 200m (20 ATM) ISO 6425 water resistance. Both are exceptional divers for their respective tiers.

CasioDuro MDV106 Black$50–$100 Check price CitizenPromaster Sea Eco-Drive Diver$250–$500 Check price

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Casio

Duro MDV106 Black

$50–$100

Check Price Full Review

Citizen

Promaster Sea Eco-Drive Diver

$250–$500

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Specifications Compared

Feature	Casio Duro MDV106 Black	Citizen Promaster Sea Eco-Drive Diver
Price	$50–$100	$250–$500
Case Size	44mm	44mm
Movement	Quartz Module 2784	Eco-Drive Caliber E168
Caliber Type	Casio Quartz (Battery)	Citizen Eco-Drive (Solar Quartz)
Power Reserve	3-Year Battery	—
Water Resistance	200m (20 ATM) Diver	200m (20 ATM) ISO 6425
Crystal	Mineral Glass	Mineral Crystal
Case Material	Stainless Steel	Stainless Steel
Origin	Casio (Japan)	Made in Japan

Category-by-Category Analysis

🎨

Design & Aesthetics

Edge: Draw

Casio's design language vs Citizen's approach

The Casio Duro MDV106 Black features a Stainless Steel case at 44mm with Mineral Glass protection. The Citizen Promaster Sea Eco-Drive Diver offers Stainless Steel construction at 44mm with Mineral Crystal. Both represent their brand's distinct design philosophy and heritage.

⚙️

Movement & Performance

Edge: Casio

Quartz Module 2784 vs Eco-Drive Caliber E168

The Duro MDV106 Black runs the Quartz Module 2784 (Casio Quartz (Battery), 3-Year Battery power reserve) at standard frequency. The Promaster Sea Eco-Drive Diver uses the Eco-Drive Caliber E168 (Citizen Eco-Drive (Solar Quartz), standard reserve) at standard. The Duro MDV106 Black edges ahead on power reserve.

📏

Wearability & Fit

Edge: Draw

44mm vs 44mm — different wrist presence

At 44mm, the Duro MDV106 Black is similarly sized compared to the Promaster Sea Eco-Drive Diver at 44mm. Water resistance differs: 200m (20 ATM) Diver vs 200m (20 ATM) ISO 6425.

💰

Value & Cost of Ownership

Edge: Casio

Casio sits in the lower tier

The Casio Duro MDV106 Black sits at $50–$100 and the Citizen Promaster Sea Eco-Drive Diver at $250–$500. On the specs that outlast any price: the Duro MDV106 Black uses Mineral Glass with 3-Year Battery, against Mineral Crystal and a standard reserve on the Promaster Sea Eco-Drive Diver. Service intervals are typically 5-7 years for both.

💧

Water Resistance

Edge: Draw

200m (20 ATM) Diver vs 200m (20 ATM) ISO 6425

The Duro MDV106 Black is rated to 200m (20 ATM) Diver while the Promaster Sea Eco-Drive Diver handles 200m (20 ATM) ISO 6425. 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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Citizen

Promaster Sea Eco-Drive Diver

Choose the Citizen Promaster Sea Eco-Drive Diver if you value Citizen Eco-Drive (Solar Quartz) technology, Made in Japan heritage, and 44mm proportions. At $250–$500, the Eco-Drive Caliber E168 with ample power reserve makes it a compelling choice.

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The Bottom Line

The Casio Duro MDV106 Black and Citizen Promaster Sea Eco-Drive Diver represent two distinct approaches to the diver category — the Casio bringing Casio (Japan) tradition while Citizen delivers Made in Japan engineering.

Frequently Asked Questions

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 Citizen Promaster Sea Eco-Drive Diver 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 Promaster Sea Eco-Drive Diver at 44mm with 200m (20 ATM) ISO 6425 is similarly capable. The Duro MDV106 Black uses Mineral Glass while the Promaster Sea Eco-Drive Diver uses Mineral 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.