Casio to Release Dust- and Mud-Resistant G-SHOCK with Rugged Full-Metal Exterior

Triple Sensor and Smartphone Link Deliver Improved Functionality

TOKYO, September 28, 2023 — Casio Computer Co., Ltd. announced today the release of the latest addition to its family of G-SHOCK shock-resistant watches. The new dust- and mud-resistant MUDMASTER GWG-B1000 features exterior components in metal for a solid, powerful design.

Since G-SHOCK first came out in 1983, Casio has continued to introduce functional, structural, and design advancements to the line’s outstanding shock resistance. Among all the great G-SHOCK watches, the Master of G line, designed for use in extreme conditions, has proven popular for its superior toughness.

The new GWG-B1000, an addition to the Master of G line, is a powerful dust- and mud-resistant MUDMASTER designed for sandy, dirty environments. The robust metal exterior retains G-SHOCK shock resistance in a rugged design with an eye-catching multi-dimensional form.

The protector parts at the 12 and 6 o’clock positions guard the watch glass, which is typically the most shock-susceptible, and they are treated with a diamond-like carbon (DLC) coating to provide even greater abrasion resistance. These parts are cut out of components that are first forged into bezel shapes in a painstaking production process that renders complex shapes in metal. The complex molded form of the front button guard is achieved with a different method, metal injection molding (MIM).*
* Metal injection molding is a technique that combines injection molding and a sintering process. Fine metal powder is mixed with a binder, injection molded in a method similar to that used with plastics, and then sintered to produce high-precision metal parts in complex three-dimensional shapes.

This timepiece also features functions that users on land missions need to execute their pursuits. It is the first G-SHOCK equipped with a triple sensor that measures compass bearing, altitude/barometric pressure, and temperature, as well as solar charging and radio wave reception, that also comes with smartphone connectivity. When the watch is paired with a smartphone, the dedicated app on the phone offers easy operation of various useful features, including Location Indicator, which points the inset dial indicator hand in the direction of a location recorded on the map within the app, and Mission Log, which records activity history.

Casio will continue to develop timepieces with ever more advanced shock resistance and original Casio functionality to support the professionals who constantly push the limits.

Metal used for protector parts at 12 and 6 o’clock positions


Shock resistant; mud resistant; vibration-resistant
Water Resistance
200 meters
Radio Frequency
77.5 kHz (DCF77: Germany); 60 kHz (MSF: UK); 60 kHz (WWVB: USA); 40 kHz (JJY: Fukushima, Japan) / 60 kHz (JJY: Kyushu, Japan); 68.5 kHz (BPC: China)
Radio Wave Reception
Automatic reception up to six times a day (except for use in China: up to five times a day); manual reception
Digital Compass
Compass function: 16 direction / direction angle (0~359°) measured, direction continuous measurement (60 seconds), north direction guideline function.
Bearing memory function. Automatic horizontal, magnetic declination, and orientation correction function
Barometric pressure measurement function (measurement range: 260~1,100hPa (7.65~32.45inHg), 1hPa (0.05inHg),
Barometric pressure trend graph display (past 20 hours displayed), pressure difference indicator (±10hPa)
Barometric pressure trend information alarm (when a characteristic change in air pressure occurs, it will be notified by arrows and sound notification)
The pressure trend graph can be changed to measurement every 2 minutes.
That’s for the last 20 minutes
Altitude measurement function/relative altimeter (measurement range: -700~10,000m(-2300~32800ft), in units of 1m (5ft))
Advanced memory (up to 30 manual memories of measurement date, month, time, and altitude),
Automatic recording data (highest/lowest altitude, autoaccumulation (ascent/descending) memory)
Altitude trend graph, altitude difference indicator (±100m/ ±1000m)
Measurement interval setting function (every 5 seconds / 2 minutes)
*Every 1 second for the first 3 minutes only
Measuring range: -10°C to 60°C (14°F to 140°F)
World Time
38 time zones (55 cities + coordinated universal time), city code display, city name display, daylight saving on/off, auto summer time (DST) switching, Home city/World time city swapping
1/100-second stopwatch
Measuring capacity: 23:59’59.99”
Split time
Countdown Timer
Measuring unit: 1 second;
Countdown range: 60 minutes;
Countdown start time setting range: 1 minute to 60 minutes (1-minute increments)
5 independent daily alarms, hourly time signal
Mobile Link
(Wireless Linking using Bluetooth®)
Auto time adjustment
Easy watch setting
Approximately 300 world time cities
App information
Time & place
Mission log
Location Indicator
Location Memory
Mode switching customization
Auto altitude correction
Phone finder
Other Functions
Sunrise/sunset time display; battery level indicator; full auto-calendar; 12/24-hour format; button operation tone on/off; full auto LED backlight (Super Illuminator) with afterglow: 1.5 or 3.0 seconds
Power Source
Tough Solar power system (solar-charging system)
Continuous Operation
About 6 months after full charge, using all functions but without solar charging
About 24 months with the power-saving function ON after full charge
Size of Case
58.7 × 52.1 × 16.2 mm
Total Weight
Approx. 114 g