Updated
Casio Duro vs Citizen Promaster Diver
Battery quartz or solar quartz, both 44mm and 200m
Quick Verdict
The Casio Duro MDV106 ($50–$100) and the Citizen Promaster Diver BN0150 ($250–$500) are both 44mm and both rated to 200m with mineral crystals. The difference is power and certification: the Duro runs on a battery, while the Promaster runs on light through Eco-Drive and carries an ISO 6425 dive rating.
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Specifications Compared
| Feature | Casio Duro MDV-106B Blue | 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
Two tool divers of the same size
Both are 44mm steel divers with bold dials and rotating bezels. Neither tries to be dressy. Choose on colour and dial preference; the specifications on the outside are very close.
Movement & Performance
Battery against solar
The Duro runs Casio quartz Module 2784 on a battery rated at about three years. The Promaster runs Citizen Eco-Drive calibre E168, which charges from light and shows a power reserve indicator. Both are quartz accurate; only the Citizen removes routine battery changes.
Durability & Water Resistance
Same 200m, but the Citizen is ISO 6425 rated
Both are rated to 200m (20 ATM) and both use mineral crystals. The Citizen is listed as ISO 6425, the international standard for dive watches. The Duro has a screw-down crown and caseback. For real diving, the ISO rating is the meaningful extra.
Wearability & Fit
Same 44mm diameter
Both are 44mm. Neither is a small-wrist watch, and on paper there is nothing to separate them on size.
Value & Cost of Ownership
The Duro is cheaper to buy, the Citizen cheaper to run
The Duro sits in the $50–$100 band and the Promaster in $250–$500. The Duro needs a battery every few years. The Promaster needs no battery changes, which narrows the gap over a long ownership but does not close it.
Our Verdict
Casio
Duro MDV-106B Blue
Choose the Casio Duro if you want the classic budget diver at the lowest price. Same size, same rating and same crystal type as the Citizen, for a band or two less.
Check Price on AmazonCitizen
Promaster Sea Eco-Drive Diver
Choose the Citizen Promaster if you never want to change a battery. Eco-Drive charges from light, there is a power reserve indicator, and the ISO 6425 rating means it meets the formal dive-watch standard.
Check Price on AmazonThe Bottom Line
The Casio Duro MDV106 and the Citizen Promaster Diver BN0150 are both 44mm dive watches rated to 200m with mineral crystals, but the Promaster is solar-powered by Citizen Eco-Drive and certified to the ISO 6425 dive standard, while the Duro runs on a replaceable battery and costs less.
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.