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Casio G-SHOCK GG-B100XM-1AER Master Of G Mudmaster Black Strap Watch - W17643
Ref. GG-B100XM-1AER
Sits in Casio’s upper tier here — more premium than three quarters of the Casio watches we list, which start at £25.
Price range £25 to £919 across 129 Casio watches in stock.The Mudmaster sits at the top of Casio's Master of G hierarchy — a sub-line built specifically for land professionals where the threat is not water but mud, dust and impact. The GG-B100 addresses something earlier Mudmasters could not: a carbon core case that resists distortion without adding bulk, combined with a dedicated mud-resistant filter and a glass-fibre-reinforced resin back cover that keeps fine particles out of the movement entirely. Bio-based resin in the case and band components is an unusual material choice for a tool watch and reflects a quieter design decision that most owners will never register consciously. At 51mm it wears as large as it looks, but the all-black execution — matte case, dark dial, matching strap — pulls the visual mass inward in a way a mixed-finish version does not. The stainless-steel bezel is mirror-finished in black ion plate, which is resistant to the scratching that would mark a standard PVD finish on a watch taken into the field. The compass, altimeter, barometer and thermometer are genuinely useful rather than decorative on a watch of this type, and the Bluetooth link to the Casio app adds Mission Log functionality — automatically pairing the watch's altitude data with smartphone GPS route tracking, which is the kind of integration that earns its place on a professional instrument.
- Reference
- GG-B100XM-1AER
- Brand
- Casio
- Collection
- G-Shock
- Case size
- 51mm
- Case material
- Two-tone
- Case shape
- Tonneau
- Dial
- Black
- Bezel
- Unidirectional rotating
- Functions
- Chronograph, GMT, Day-date, Small seconds, Moonphase, Power reserve indicator, Tachymeter, Skeleton dial, Stopwatch, Countdown timer, Alarm, Backlight, World time, Perpetual calendar, Solar powered, Radio controlled, Bluetooth, Step counter, Heart rate, GPS, Compass, Thermometer, Altimeter, Tide graph, Dual display
- Water resistance
- 200m
- Bracelet / strap
- Mesh bracelet
- Strap colour
- Bronze
- Retailer
- F.Hinds
Learn more about Casio
Tadao Kashio founded Kashio Seisakujo in Tokyo in 1946 as a machine shop. The company's first success was a finger ring that held a cigarette, and its second was the 14-A of 1957 — the world's first all-electric compact calculator, which used solenoids rather than gears.
Casio entered watchmaking in 1974 with the Casiotron, a digital watch with an automatic calendar that knew the varying lengths of months. The company approached watches as an electronics manufacturer rather than a horological one, and that difference produced the G-Shock.
The G-Shock came from a single engineer, Kikuo Ibe, who broke a watch his father had given him and set out to build one that could not break. The specification was three tens: survive a ten-metre drop, ten bars of water pressure, and ten years of battery life. It took over two hundred prototypes, and the solution was suspending the module inside the case on a cushioned internal structure rather than mounting it rigidly. The DW-5000C shipped in 1983.
It became one of the most durable product designs in any category, adopted by militaries, emergency services, and skateboarders alike, and Casio has since added solar charging, radio and GPS timekeeping, Bluetooth, and full-metal and carbon variants.
Casio also produces the Edifice, Pro Trek, and Oceanus lines, and remains an independent Japanese public company.
- 1946
- Tadao Kashio founds the company in Tokyo.
- 1974
- The Casiotron is Casio's first digital watch.
- 1983
- The G-Shock DW-5000C survives Kikuo Ibe's three-tens brief.
- 1994
- The Frogman extends G-Shock to ISO dive certification.
Manufacturer’s guarantee
Best of 2 retailers
What the specifications mean
A watch built to be worn hard and got wet.
Strengths
- 200m water resistance, rated for actual diving
- Sapphire crystal, which resists scratching
- Luminous hands and markers for low light
- Second time zone for travelling
- One of Casio's more premium watches
Worth knowing
- 51mm is a large watch with real presence
Compare alternatives
Watches from other brands at a similar price, style and size, so you can see what else your budget can buy.
| Specification |  GG-B100XM-1AER |  010-02935-03 |
|---|---|---|
| Price | £369 | £390 |
| Case size | 51mm | 50mm |
| Water resistance | 200m | 100m |
| Movement | Solar | Solar |
| Strap | Mesh bracelet | Silicone strap |
| This watch |
|
Your new watch
Frequently asked questions, and things you should know about this watch
Can I swim with it?
Yes. At 200m it is rated for swimming, snorkelling and recreational diving.
Will the glass scratch?
Unlikely. Sapphire is second only to diamond in hardness and shrugs off everyday marking.
Does it need a battery?
No. It charges from light, and the cell behind that is designed to last a decade or more.
Is it a men's or women's watch?
Listed as men's.
Cheapest place to buy
Both F.Hinds and Goldsmiths list it at £369, so choose on delivery and warranty rather than price.
Who are F.Hinds?
F.Hinds has been run by the same family since 1856 and is now in its fifth generation, with more than 115 shops across England and Wales. They are a member of the Responsible Jewellery Council and an Authorised Diamond Dealer.
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