Bulova Surveyor Automatic vs Casio G-Shock GA-B2100 CasiOak
Bulova's dress watch meets Casio's diver
Quick Verdict
The Casio G-Shock GA-B2100 CasiOak ($100–$150) delivers Casio Quartz (Solar-Powered) technology in the tier below the Bulova Surveyor Automatic ($250–$500). The G-Shock GA-B2100 CasiOak measures 45.4mm (48.5mm lug-to-lug, 11.9mm thick) and is rated 200m (20 ATM). The Surveyor Automatic justifies its premium with Made in Japan (Movement) heritage and Automatic Miyota 8215. Both represent excellent choices in the luxury watch category.
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Specifications Compared
| Feature | Bulova Surveyor Automatic | Casio G-Shock GA-B2100 CasiOak |
|---|---|---|
| Price | $250–$500 | $100–$150 |
| Case Size | 39mm | 45.4mm (48.5mm lug-to-lug, 11.9mm thick) |
| Movement | Automatic Miyota 8215 | Quartz Module 5689 (Tough Solar + Bluetooth) |
| Caliber Type | Miyota Automatic | Casio Quartz (Solar-Powered) |
| Power Reserve | 42 Hours | About 7 months on a full charge without light; about 18 months in power-saving (Casio) |
| Water Resistance | 30m (3 ATM) | 200m (20 ATM) |
| Crystal | Sapphire Crystal | Mineral Glass |
| Case Material | Stainless Steel | Carbon Core Guard Resin |
| Origin | Made in Japan (Movement) | Made in Japan |
Category-by-Category Analysis
Design & Aesthetics
Bulova's design language vs Casio's approach
The Bulova Surveyor Automatic features a Stainless Steel case at 39mm with Sapphire Crystal 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
Automatic Miyota 8215 vs Quartz Module 5689 (Tough Solar + Bluetooth)
The Surveyor Automatic runs the Automatic Miyota 8215 (Miyota Automatic, 42 Hours power reserve) at 21,600 vph (3 Hz) 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 Surveyor Automatic edges ahead on power reserve.
Wearability & Fit
39mm vs 45.4mm (48.5mm lug-to-lug, 11.9mm thick) — different wrist presence
At 39mm, the Surveyor Automatic 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: 30m (3 ATM) vs 200m (20 ATM).
Value & Cost of Ownership
Casio sits in the lower tier
The Bulova Surveyor Automatic sits at $250–$500 and the Casio G-Shock GA-B2100 CasiOak at $100–$150. On the specs that outlast any price: the Surveyor Automatic uses Sapphire Crystal with 42 Hours, 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
30m (3 ATM) vs 200m (20 ATM)
The Surveyor Automatic is rated to 30m (3 ATM) while the G-Shock GA-B2100 CasiOak handles 200m (20 ATM). The G-Shock GA-B2100 CasiOak offers superior water resistance.
Our Verdict
Bulova
Surveyor Automatic
Choose the Bulova Surveyor Automatic if you prioritize Miyota Automatic engineering, Made in Japan (Movement) craftsmanship, and 30m (3 ATM) water resistance. At $250–$500, it delivers Automatic Miyota 8215 with 42 Hours 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 Bulova Surveyor Automatic and Casio G-Shock GA-B2100 CasiOak represent two distinct approaches to fine watchmaking — the Bulova bringing Made in Japan (Movement) 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.