Along with the GW-9400J-1BJF/GW-9400-1B Rangeman, the G-Shock GG-B100-1BJF Mudmaster is another Black Out edition for January 2020 in Japan.
Part of the GG-B100 Mudmaster series featuring the Quad Sensor (altimeter-barometer, compass, thermometer, and step counter with power save function) and Bluetooth mobile link, the GG-B100-1B offers a mostly matte black appearance along with touches of gray, Neo-Brite luminous white hands, and silver buttons.
The GG-B100-1B has a carbon fiber insert bezel and a carbon fiber reinforced resin case with a double back cover that is resistant to mud and dust. Other features include shock resistance, 200-meter water resistance, sunrise/sunset data, world time, stopwatch, 24-hour countdown timer, five alarms, and auto Super Illuminator dual LED lights.
The GG-B100-1BJF has a list price of ¥45,000 JPY in Japan. The GG-B100-1B is also expected to be released outside of Japan.
Update: Casio America announced the GGB100-1B for a late February 2020 release, with a list price of $380 USD.
Update 2: The GG-B100-1B is also a February 2020 release throughout Asia.
Related: The GWG-1000-1A1 Mudmaster, still a currently active release, offers the same color scheme with the larger GWG-1000 base featuring Tough Solar power, Multi-Band 6 radio timekeeping, and the Triple Sensor.
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