Updated
Casio Duro MDV106 Black vs Casio G-Shock GA-B2100 CasiOak
Two divers compared — $50–$100 vs $100–$150
Quick Verdict
The Casio Duro MDV106 Black ($50–$100) offers Casio Quartz (Battery) precision in the tier below the Casio G-Shock GA-B2100 CasiOak ($100–$150). The Duro MDV106 Black measures 44mm and is rated 200m (20 ATM) Diver. The G-Shock GA-B2100 CasiOak counters with Made in Japan craftsmanship and 200m (20 ATM) water resistance. Both are exceptional divers for their respective tiers.
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Specifications Compared
| Feature | Casio Duro MDV106 Black | Casio G-Shock GA-B2100 CasiOak |
|---|---|---|
| Price | $50–$100 | $100–$150 |
| Case Size | 44mm | 45.4mm (48.5mm lug-to-lug, 11.9mm thick) |
| Movement | Quartz Module 2784 | Quartz Module 5689 (Tough Solar + Bluetooth) |
| Caliber Type | Casio Quartz (Battery) | Casio Quartz (Solar-Powered) |
| Power Reserve | 3-Year Battery | About 7 months on a full charge without light; about 18 months in power-saving (Casio) |
| Water Resistance | 200m (20 ATM) Diver | 200m (20 ATM) |
| Crystal | Mineral Glass | Mineral Glass |
| Case Material | Stainless Steel | Carbon Core Guard Resin |
| Origin | Casio (Japan) | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Casio's design language vs Casio's approach
The Casio Duro MDV106 Black features a Stainless Steel case at 44mm with Mineral Glass protection. The Casio G-Shock GA-B2100 CasiOak offers Carbon Core Guard Resin construction at 45.4mm (48.5mm lug-to-lug, 11.9mm thick) with Mineral Glass. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Quartz Module 2784 vs Quartz Module 5689 (Tough Solar + Bluetooth)
The Duro MDV106 Black runs the Quartz Module 2784 (Casio Quartz (Battery), 3-Year Battery power reserve) at standard frequency. The G-Shock GA-B2100 CasiOak uses the Quartz Module 5689 (Tough Solar + Bluetooth) (Casio Quartz (Solar-Powered), About 7 months on a full charge without light; about 18 months in power-saving (Casio) reserve) at standard. The G-Shock GA-B2100 CasiOak offers a longer power reserve.
Wearability & Fit
44mm vs 45.4mm (48.5mm lug-to-lug, 11.9mm thick) — different wrist presence
At 44mm, the Duro MDV106 Black wears more compactly on smaller wrists compared to the G-Shock GA-B2100 CasiOak at 45.4mm (48.5mm lug-to-lug, 11.9mm thick). Water resistance differs: 200m (20 ATM) Diver vs 200m (20 ATM).
Value & Cost of Ownership
Casio sits in the lower tier
The Casio Duro MDV106 Black sits at $50–$100 and the Casio G-Shock GA-B2100 CasiOak at $100–$150. On the specs that outlast any price: the Duro MDV106 Black uses Mineral Glass with 3-Year Battery, against Mineral Glass and About 7 months on a full charge without light; about 18 months in power-saving (Casio) on the G-Shock GA-B2100 CasiOak. Service intervals are typically 5-7 years for both.
Water Resistance
200m (20 ATM) Diver vs 200m (20 ATM)
The Duro MDV106 Black is rated to 200m (20 ATM) Diver while the G-Shock GA-B2100 CasiOak 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.
Check Price on AmazonCasio
G-Shock GA-B2100 CasiOak
Choose the Casio G-Shock GA-B2100 CasiOak if you value Casio Quartz (Solar-Powered) technology, Made in Japan heritage, and 45.4mm (48.5mm lug-to-lug, 11.9mm thick) proportions. At $100–$150, the Quartz Module 5689 (Tough Solar + Bluetooth) with About 7 months on a full charge without light; about 18 months in power-saving (Casio) power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Casio Duro MDV106 Black and Casio G-Shock GA-B2100 CasiOak represent two distinct approaches to the diver category — the Casio bringing Casio (Japan) tradition while Casio 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.