Casio Launches G-Shock Mudmaster GG-B100XMH-5A in Gold Tone

The G-Shock Mudmaster typically cuts an imposing figure on the wrist, evoking rescue equipment, construction machinery, and military-issue supply crates. Known for its oversized dimensions and exposed hardware, the flagship outdoor tool watch has received a striking aesthetic shift. Casio introduced the Mudmaster GG-B100XMH-5A as part of a wider trio dubbed the Master in Horizon Gold collection, which brings a refined color palette to the brand’s most heavy-duty lineup.

Design and Dimensions of the Horizon Gold Mudmaster

While the watch carries a more glamorous finish than standard tactical models, its core proportions remain entirely unchanged. The timepiece measures 55.4 × 51.3 × 19.4mm, maintaining a thickness of nearly two centimeters, and tips the scale at 104 grams. Dark brown bio-based resin frames the case and strap, while matching brown ion-plated metal pins secure the bezel.

The defining visual update centers on a light yellow-gold ion-plated stainless steel bezel resting over a black carbon case. According to brand materials, the design is inspired by the golden horizon where earth meets sky, capturing the awe-inspiring power of nature as earth meets sky. Rather than looking like jewelry, the muted gold tone resembles weathered brass or expedition hardware, complemented by gold-toned numerals, matching hands, and a bright red seconds hand against the black dial.

Rugged Construction and Quad Sensor Technology

Beneath the gold-toned exterior, the hardware remains a familiar beast for outdoor professionals. The watch utilizes a carbon-fiber-reinforced resin inner case built on Casio’s Carbon Core Guard structure, delivering high rigidity, shock resistance, and 200 meters of water resistance.

Protection against harsh elements is bolstered by a specialized mud filter designed to prevent fine dirt, sand, and mud from breaching the case, alongside a glass-fiber-reinforced resin caseback. Functionality matches durability via the built-in Quad Sensor system, providing a digital compass, altimeter, barometer, thermometer, and a step counter that tracks up to 999,999 steps.

Smartphone Connectivity and Mission Log Integration

Modern utility meets field-tested reliability through Bluetooth connectivity, which links the watch directly to the CASIO WATCHES app for automatic time adjustments and simplified world time configuration across 38 cities. The application also supports the Mission Log feature, combining altitude data recorded by the watch with route information captured by a paired smartphone’s GPS to log outdoor activity.

For low-light visibility, the watch features a double white LED system—providing an auto-light super illuminator for both the dial and the digital LCD display. Power is supplied by a standard CR2025 battery rated for approximately two years of operation rather than solar charging.

Pricing and International Availability

While international listings have begun appearing on official channels, regional rollout details remain varied. Australian pricing and availability remain unconfirmed by the manufacturer, and official word on whether the Mudmaster variant will launch in the United States has not yet been released.