Updated
Casio G-Shock GA-B2100 CasiOak vs Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial)
Casio's diver meets Omega's chronograph
Quick Verdict
The Casio G-Shock GA-B2100 CasiOak ($100–$150) offers Casio Quartz (Solar-Powered) precision in the tier below the Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) ($10,000–$25,000). The G-Shock GA-B2100 CasiOak measures 45.4mm (48.5mm lug-to-lug, 11.9mm thick) and is rated 200m (20 ATM). The Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) counters with Swiss Made craftsmanship and 1200m (120 bar) water resistance. Both are exceptional watches for their respective tiers.
Transparency — We earn a small commission on purchases made through our Amazon links. This doesn't affect our editorial independence.
Omega
Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial)
$10,000–$25,000
Specifications Compared
| Feature | Casio G-Shock GA-B2100 CasiOak | Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) |
|---|---|---|
| Price | $100–$150 | $10,000–$25,000 |
| Case Size | 45.4mm (48.5mm lug-to-lug, 11.9mm thick) | 55 x 48mm, 18.26mm thick, 48mm lug to lug |
| Movement | Quartz Module 5689 (Tough Solar + Bluetooth) | Omega Co-Axial Master Chronometer calibre 8912, automatic, METAS certified, time zone function |
| Caliber Type | Casio Quartz (Solar-Powered) | Omega 8912, Master Chronometer |
| Power Reserve | About 7 months on a full charge without light; about 18 months in power-saving (Casio) | About 60 hours |
| Water Resistance | 200m (20 ATM) | 1200m (120 bar) |
| Crystal | Mineral Glass | Flat sapphire, anti-reflective both sides |
| Case Material | Carbon Core Guard Resin | Grade 5 titanium with 18k Sedna gold bezel-lock pusher and crown, bidirectional polished blue bezel with Ceragold numerals, helium escape valve, screw-in crown |
| Origin | Made in Japan | Swiss Made |
Category-by-Category Analysis
Design & Aesthetics
Casio's design language vs Omega's approach
The Casio G-Shock GA-B2100 CasiOak features a Carbon Core Guard Resin case at 45.4mm (48.5mm lug-to-lug, 11.9mm thick) with Mineral Glass protection. The Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) offers Grade 5 titanium with 18k Sedna gold bezel-lock pusher and crown, bidirectional polished blue bezel with Ceragold numerals, helium escape valve, screw-in crown construction at 55 x 48mm, 18.26mm thick, 48mm lug to lug with Flat sapphire, anti-reflective both sides. Both represent their brand's distinct design philosophy and heritage.
Movement & Performance
Quartz Module 5689 (Tough Solar + Bluetooth) vs Omega Co-Axial Master Chronometer calibre 8912, automatic, METAS certified, time zone function
The G-Shock GA-B2100 CasiOak runs 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) power reserve) at standard frequency. The Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) uses the Omega Co-Axial Master Chronometer calibre 8912, automatic, METAS certified, time zone function (Omega 8912, Master Chronometer, About 60 hours reserve) at standard. The Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) offers a longer power reserve.
Wearability & Fit
45.4mm (48.5mm lug-to-lug, 11.9mm thick) vs 55 x 48mm, 18.26mm thick, 48mm lug to lug — different wrist presence
At 45.4mm (48.5mm lug-to-lug, 11.9mm thick), the G-Shock GA-B2100 CasiOak wears more compactly on smaller wrists compared to the Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) at 55 x 48mm, 18.26mm thick, 48mm lug to lug. Water resistance differs: 200m (20 ATM) vs 1200m (120 bar).
Value & Cost of Ownership
Casio sits in the lower tier
The Casio G-Shock GA-B2100 CasiOak sits at $100–$150 and the Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) at $10,000–$25,000. On the specs that outlast any price: the G-Shock GA-B2100 CasiOak uses Mineral Glass with About 7 months on a full charge without light; about 18 months in power-saving (Casio), against Flat sapphire, anti-reflective both sides and About 60 hours on the Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial). Service intervals are typically 5-7 years for both.
Water Resistance
200m (20 ATM) vs 1200m (120 bar)
The G-Shock GA-B2100 CasiOak is rated to 200m (20 ATM) while the Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) handles 1200m (120 bar). The Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) offers superior water resistance.
Our Verdict
Casio
G-Shock GA-B2100 CasiOak
Choose the Casio G-Shock GA-B2100 CasiOak if you prioritize Casio Quartz (Solar-Powered) engineering, Made in Japan craftsmanship, and 200m (20 ATM) water resistance. At $100–$150, it delivers 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.
Check Price on AmazonOmega
Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial)
Choose the Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) if you value Omega 8912, Master Chronometer technology, Swiss Made heritage, and 55 x 48mm, 18.26mm thick, 48mm lug to lug proportions. At $10,000–$25,000, the Omega Co-Axial Master Chronometer calibre 8912, automatic, METAS certified, time zone function with About 60 hours power reserve makes it a compelling choice.
Check Price on AmazonThe Bottom Line
The Casio G-Shock GA-B2100 CasiOak and Omega Seamaster Ploprof 1200M Co-Axial Master Chronometer 55 x 48mm 227.60.55.21.03.001 (titanium and Sedna gold, blue lacquered dial) represent two distinct approaches to fine watchmaking — the Casio bringing Made in Japan tradition while Omega delivers Swiss Made engineering.
Frequently Asked Questions
More Comparisons
Explore These Watches
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.