CASIO G-SHOCK GG-B100XMH-5ADR MUDMASTER MASTER OF G BROWN MEN WATCH
GG-B100XMH-5ADR
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- 1 Year Warranty
The G-SHOCK GG-B100XMH-5ADR is the Mudmaster in Master in Horizon Gold, a Master of G colourway drawn from the golden band of light where the earth meets the sky. A stainless steel bezel finished in light yellow gold ion plating sits over the carbon case, key metal components carry brown ion plating, and the whole thing runs on a dark brown resin band. It is the warmest the Mudmaster gets without losing anything underneath.
The construction is unchanged from the rest of the GG-B100X family: a carbon fibre-reinforced resin case built on Carbon Core Guard, a filter guarding against mud, and a back cover of shock-resistant fine resin strengthened with glass fibre. That earns the mud-resistant rating alongside 200-metre water resistance. The metal bezel adds 11 grams over the resin-bezel version, bringing it to 104 grams.
Functionally it is the full Master of G land package: Quad Sensor with digital compass, altimeter, barometer and thermometer, plus a 3-axis accelerometer for step counting. Bluetooth pairing with the CASIO WATCHES app corrects the time automatically and opens the Mission Log, which records altitude from the watch against route data from your phone.
At a Glance
- BrandCasio G-SHOCK
- LineMaster of G – Land, Mudmaster
- SeriesMaster in Horizon Gold
- ModelGG-B100XMH-5ADR
- Module5744
- Case Size55.4 × 51.3 × 19.4 mm
- Weight104g
- BezelStainless Steel, Light Yellow Gold IP
- BandDark Brown Bio-Based Resin
- SensorsQuad Sensor
- Water Resistance200m (20 BAR)
- Battery LifeApprox. 2 Years
Why You'll Love It
- Master in Horizon Gold is a considered colourway rather than a gold finish applied for its own sake — light yellow gold ion plating on the bezel, brown ion plating on key metal components, dark brown resin band, all pulled from the tone of a horizon at sunrise.
- Ion plating is a bonded surface treatment rather than a coating laid on top, so the gold finish holds up to the kind of contact this watch is built for.
- Four sensors in one watch — compass, altimeter, barometer and thermometer — plus a step counter, so you can read the terrain and the weather without reaching for a phone.
- Mud resistance is a separate rating from water resistance, and very few watches carry it. A dedicated filter and a sealed carbon structure keep grit and slurry out of the module, not just water.
- At 104 grams the metal bezel adds presence without the weight penalty you would expect. The carbon fibre-reinforced case is what absorbs that difference.
- Bluetooth pairing handles time correction automatically through the CASIO WATCHES app, and the Mission Log builds a record of where you went and how high you climbed.
- The double LED system lights both the analog face and the digital display, with Super Illuminator brightness and selectable 1.5 or 3 second duration plus afterglow.
Perfect For
- Hiking & Trail
- Overlanding & 4WD
- Camping
- Gold Tone Fans
- Sensor Watch Users
- Master of G Collectors
- Statement Everyday Wear
- Gift for Him
Key Features
- Light yellow gold ion plated stainless steel bezel — the defining element of the Master in Horizon Gold series, with brown ion plating on key metal components and a dark brown resin band to complete the colourway.
- Quad Sensor — digital compass (16 points, 0 to 359°, 60 seconds continuous measurement, magnetic declination correction), altimeter (−700 to 10,000m in 1m units), barometer (260 to 1,100 hPa in 1 hPa units with tendency graph and change alarm) and thermometer (−10 to 60°C in 0.1°C units), plus a 3-axis accelerometer step counter reading to 999,999 steps.
- Carbon Core Guard structure — carbon fibre-reinforced resin case for high rigidity and a tight seal, with carbon fibre-reinforced resin also used for the cover enclosing the case back.
- Mud resistant and dust resistant — a dedicated filter guards against mud, backed by a shock-resistant glass-fibre-strengthened resin back cover.
- Bluetooth smartphone link — pairs with the CASIO WATCHES app for automatic time adjustment, easy watch setting, approximately 300 world time cities, Mission Log, Life Log, Location Indicator, Location Memory, auto altitude correction and phone finder.
- 200-metre water resistance (20 BAR) — rated for swimming, snorkelling and recreational water sports. Not rated for saturation diving.
- Double LED light with Super Illuminator — separate LED for the analog face and LED backlight for the digital display, auto light, selectable 1.5 or 3 second duration, afterglow. White LED.
- Hand shift feature — the analog hands move clear of the digital display so readouts are never obscured.
- Full timekeeping suite — world time across 38 time zones, sunrise and sunset display, 1/100-second stopwatch to 24 hours, 24-hour countdown timer, 5 daily alarms, hourly signal, full auto-calendar to 2099, and Neobrite luminous treatment.
Technical Specifications
The Casio G-SHOCK GG-B100XMH-5ADR is a Mudmaster analog-digital watch on module 5744 from the Master in Horizon Gold series, built with a Carbon Core Guard structure pairing a bio-based carbon case with a stainless steel bezel in light yellow gold ion plating. It measures 55.4 × 51.3 × 19.4mm and weighs 104 grams, with spherical mineral glass, a dark brown bio-based resin band adjustable from 145mm to 215mm, and shock, mud and dust resistant construction rated to 200 metres of water resistance. It carries a Quad Sensor package of digital compass, altimeter, barometer, thermometer and 3-axis accelerometer step counter, connects over Bluetooth to the CASIO WATCHES app for automatic time adjustment, holds ±15 seconds per month without mobile link, and runs approximately two years on a CR2025 battery.
| Model Number | GG-B100XMH-5ADR |
| Case & Bezel Material | Bio-Based Carbon / Stainless Steel |
| Surface Treatment | Light Yellow Gold Ion Plated Bezel |
| Construction | Shock Resistant, Mud Resistant, Carbon Core Guard |
| Case Size (L × W × H) | 55.4 × 51.3 × 19.4 mm |
| Weight | 104g |
| Glass | Mineral, Spherical |
| Water Resistance | 200 Metres (20 BAR) |
| Other | Neobrite |
| Digital Compass | 16 Points, 0 to 359°, 1° Units |
| Altimeter | −700 to 10,000m, 1m Units |
| Barometer | 260 to 1,100 hPa, 1 hPa Units |
| Thermometer | −10 to 60°C, 0.1°C Units |
| Step Counter | 3-Axis Accelerometer, 0 to 999,999 Steps |
| Smartphone Link | Bluetooth (CASIO WATCHES App) |
| Time Adjustment | Automatic via Smartphone |
| World Time | 38 Time Zones + UTC |
| Stopwatch | 1/100 Second, 24 Hours |
| Timer | Countdown, 24 Hours |
| Alarms | 5 Daily + Hourly Signal |
| Light | Double LED, Super Illuminator (White) |
| Calendar | Full Auto-Calendar to 2099 |
| Display | Analog 3 Hands + Digital |
| Band Material | Bio-Based Resin (Dark Brown) |
| Compatible Band Size | 145mm to 215mm |
| Accuracy | ±15 Seconds Per Month (No Mobile Link) |
| Battery | CR2025 |
| Battery Life | Approx. 2 Years |
Best Matched With
- Olive Field Jacket
- Tan Cargo Trousers
- Brown Leather Boots
- Cream Knit
- Technical Shell
- Khaki Overshirt
- Dark Denim
Frequently Asked Questions
What is Master in Horizon Gold?
It is a Master of G series built around the colour of the horizon where earth meets sky. The design uses a metal bezel in light yellow gold ion plating with key metal components accented in brown ion plating, paired with a dark brown resin band. The GG-B100XMH-5A is the Mudmaster in the series, alongside the GR-B300H-5A and the GW-9500MH-5.
Will the gold finish wear off?
Ion plating bonds the finish to the steel at a molecular level rather than laying a coating on the surface, which makes it considerably more durable than conventional plating. It will still show wear over years of heavy contact with abrasive surfaces. Rinse with fresh water after exposure to salt or grit, and avoid spraying solvents or cleaning chemicals directly onto the bezel.
What is the Quad Sensor and what does it measure?
Quad Sensor is G-SHOCK's four-sensor package: a digital compass reading direction to 16 points, an altimeter covering −700 to 10,000 metres, a barometer covering 260 to 1,100 hPa with a pressure tendency graph and change alarm, and a thermometer covering −10 to 60°C. A 3-axis accelerometer adds step counting on top.
What does mud resistant mean, and how is it different from water resistant?
Water resistance keeps liquid out. Mud resistance keeps solids out — grit, sand, slurry and debris that can work into button shafts and case seams where water alone would drain away. This model uses a dedicated filter against mud, a sealed carbon fibre-reinforced case and a back cover of shock-resistant resin strengthened with glass fibre. Both ratings apply here: mud resistant and 200 metres.
Is this watch solar powered?
No. The GG-B100XMH-5ADR runs on a CR2025 battery with a life of approximately two years. It corrects its own time over Bluetooth rather than by solar or radio signal, so there is no charging behaviour to manage — just a battery change roughly every two years, which any City Chain outlet can handle.
How does this compare to the resin-bezel GG-B100X models?
Module, sensors, construction and the 200-metre rating are identical. The difference is the bezel: the XMH uses a stainless steel bezel with gold ion plating where the GG-B100X-1A, 1A3 and 1A9 use a carbon fibre bezel in resin. That takes the weight from 93 grams to 104 grams and changes the register from equipment to something with more presence.
Can I swim or dive with it?
You can swim and snorkel with it. 200-metre (20 BAR) water resistance covers swimming, surfing and recreational water sports. It is not rated for saturation diving or use with helium-based gas mixtures. Avoid operating the buttons while the watch is submerged.
Is 55.4mm too big for my wrist?
It is a large watch by any standard. At 104 grams it stays manageable through a full day, but the 51.3mm width will overhang on wrists under about 16cm. The band fits 145mm to 215mm. Worth trying on in store before you commit.
Can the resin band be shortened?
The bio-based resin band is a buckle-and-holes design covering 145mm to 215mm with no tooling required. Unlike a metal bracelet there are no links to remove, so there is no in-store sizing step — set it to the hole that fits and you are done.
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