Casio will release the new G-Shock Mudman GW-9502KJ-8 in Japan on November 14. It is a special Master of G-Land model created with Earthwatch Japan and has been open for pre-orders at ¥64,900 (~$420).

The design is based on the endangered hippopotamus. The bezel and band use biomass plastic and have a rough, uneven surface to match the texture of hippo skin. The metal parts around the buttons are finished in rose gold ion plating. Earthwatch Japan’s message, “Change the World. Yourself,” is printed on the band, and its logo is on the band ring. The same logo appears when the LED backlight is turned on and is also engraved on the case back. The watch comes in a box made from recycled paper.


Earthwatch Japan is an international NGO founded in 1971. It supports more than 100 field research projects each year and works with researchers and volunteers around the world. Casio has been creating environmental collaboration models since the 1990s, and this edition continues that work.
The GW-9502KJ-8 keeps the full Mudman feature set. It has shock resistance, dust resistance, mud resistance, and a Carbon Core Guard structure. The watch uses Tough Solar and has 20 bar water resistance. It weighs 81 grams and measures 56.7 by 52.7 by 14.8 mm.
Time is controlled through Multi-Band 6 radio signals from Japan, North America, Europe, and China. It includes triple sensors for direction, barometric pressure, altitude, and temperature. Other functions include a barometric trend graph, altitude memory, 14 climbing records, temperature readings from minus 10 degrees to 60 degrees Celsius, sunrise and sunset times, world time for 48 cities, a 1/10 second stopwatch with a 1,000 hour counter, a 24 hour timer, and five alarms. The LED backlight is a white super illuminator.
Battery life is about six months on a full charge without solar input and about 26 months in power saving mode. Accuracy is plus or minus 15 seconds per month when radio reception is not available.
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