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Casio has expanded its US watch lineup with three new models from its Master of G series. The watches, which were initially released in Japan last month, are part of a new Horizon Gold collection.
The lineup includes the Gravitymaster GRB300H-5A, the Mudmaster GGB100XMH-5A, and the Mudman GW9500MH-5. All three are currently available for purchase on the Casio US website.

Design Details & Pricing
The updates are purely cosmetic, with all three watches featuring light yellow-gold ion-plated bezels, brown metal accents, and dark brown bio-based resin bands. Their core hardware and features remain unchanged from the standard models.
The Gravitymaster GRB300H-5A is the most affordable model in the collection at $330. It features a carbon fiber-reinforced resin case, an analog dial with dual-time display, and a rotary indicator for battery, stopwatch, and alarm status. The watch also supports Tough Solar charging and Bluetooth connectivity with the Casio Watches app for automatic time adjustment.


The Mudmaster GGB100XMH-5A costs $460 and features a stainless steel bezel with a mud and dust-resistant case. Its quad-sensor system includes a compass, altimeter/barometer, thermometer, and step counter, while Bluetooth enables altitude and route logging. It runs on a CR2025 battery with an estimated two-year lifespan.


The third model is the Mudman GW9500MH-5, priced at $440. It features a mud- and dust-resistant case, a duplex LCD, and a Triple Sensor for compass, altitude/barometric pressure, and temperature readings. It runs on solar power and uses Multi-Band 6 radio signals for automatic time calibration.


All three models include standard G-Shock specifications, such as 200-meter water resistance, shock-resistant construction, daily alarms, and LED illumination.
In related news, Casio has recently launched an Apple Watch-shaped moon-phase watch with a sleek silver dial in the US, alongside new F-91WF watches featuring recycled bands and the same iconic design.
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