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G-Shock

Casio G-Shock GWG-B1000-1AJF Master of G Series MUDMASTER Flagship Model Triple Sensor Japan Import New

  • Based on 87 reviews
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Availability: Only 2 left in stock, order soon!
Fulfilled by Ichigo Ichie Japan (Import Duty Free)
Arrives Mar 11 – Mar 25
Order within 23 hours and 6 minutes
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Description

The MUDMASTER from G-Shock's Master of G line, was made for comfort and functionality in the toughest environments. It's solar powered, radio- controlled and has a triple sensor (compass, altimeter/barometer, and thermometer). It also has a mobie link through Bluetooth.

Package Dimensions ‏ : ‎ 4.61 x 3.7 x 3.66 inches; 4.02 ounces


Item model number ‏ : ‎ GWG-B1000-1AJF


Department ‏ : ‎ mens


Batteries ‏ : ‎ 1 Unknown batteries required. (included)


Date First Available ‏ : ‎ October 11, 2023


Manufacturer ‏ : ‎ Casio Computer


Product Warranty: For warranty information about this product, please click here


Best Sellers Rank: #706,360 in Clothing, Shoes & Jewelry (See Top 100 in Clothing, Shoes & Jewelry) #3,416 in Men's Wrist Watches


#3,416 in Men's Wrist Watches:


Brand, Seller, or Collection Name: G-Shock


Clasp: Tang Buckle


Model number: GWG-B1000-1AJF


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Mar 11 – Mar 25

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Top Amazon Reviews

    • It's BEAUTY & THE BEAST
Based on owning one for over a year. In short: this watch is exceptional. If you’re into rugged, feature‑packed tool watches, it really delivers. But like any high‑end tough watch, it has trade‑offs. I’ll cover everything—what I love, what could be better, and whether it’s worth the price. What Makes It Amazing (What I Love) After a year of daily wear, especially outdoors, travel, and “real‑work” use, these are the highlights: Durability This thing really lives up to its rugged billing. Mud, rain, grit, dirt, occasional bumps—all no problem. The “Mud Resistance / Mudmaster” name is not just hype. The button guards, sealings, materials hold up. Even after rough use there’s minimal cosmetic wear (very, very light scratches here and there) and zero functional issues. Reliability / Power Solar charging works well. Even with mixed conditions (indoors some days, outdoors others), the battery remains in healthy levels. Also the Multi‑Band 6 atomic time sync keeps time dead‑on without needing constant manual adjustment. For a guy who travels or changes timezone occasionally, that’s a huge relief. Sensor Suite & Utility * Altimeter/barometer: I use these often when hiking. The trends are useful (pressure rises/falls). * Compass: very handy when navigating off‑road. The bearing memory and location indicator functions (via the app) add extra value (set a point, coming back to it etc.). * Thermometer: works decently well (though you need to remove watch, let it settle to ambient) but adequate. * Sunrise/sunset: surprisingly useful. I don’t need to pull out my phone constantly to check light conditions. Visibility & Readability The sapphire crystal is excellent—no hazing or major scratches. The anti‑reflective coating helps a lot in bright sun. The analog hands are large enough, clear; the Neobrite luminescence (glow) is decent, enough to read things after dark. The dials and subdials are intuitive (once you’ve gotten used to where everything is). Build & Style / Presence Let’s face it: this watch *looks* and *feels* like a flagship. It has weight, heft, and that “pro tool” aesthetic. The metal + resin + carbon/bio‑resin combination gives it both toughness and a refined edge. On‑wrist it commands attention without being gaudy. Added Modern Conveniences Bluetooth + app connectivity, location‑indicator functions, auto correction of altitude, ability to adjust settings via phone—these make using it much more convenient than purely analog/digital watches without these features. Things That Could Be Better (Trade‑Offs / Minor Drawbacks) Even though the watch is amazing, there *are* trade‑offs and “wish’d it were slightly more perfect” bits (just to give a balanced view): Size & Bulk It is large and thick. The 16‑mm thickness plus wide band make it feel chunky. On smaller wrists (or under tight shirt cuffs) it can be a bit intrusive. For everyday formal wear, it might be overkill. Complexity / Learning Curve There are a lot of modes, subdials, buttons. If you don’t read the manual (or use the app) to understand what each sensor, dial, subdial, or function is doing, it can be a bit confusing. Adjusting, calibrating sensors (esp compass/altimeter), knowing how to use bearing memory etc. requires some patience. Response Time / Sensor Precision Some sensors (like temperature) lag behind environment unless you let the watch stabilize. The compass occasionally requires recalibration in various magnetic environments. The altitude readings are accurate but not perfect—especially in changing weather conditions or when moving quickly. That’s expected, though, given the tech. Weight vs Comfort While 114g is lighter than some comparable tool watches, it’s still noticeable. After several hours of wear (especially doing strenuous things or arm movements) you feel that weight. The band is rugged but not super plush; for extended wear (e.g., all‑day hike), pairing with lighter straps (if possible) helps. Price This is a premium model, and the price reflects that. For those who need only basic functionality (such as time and stopwatch), there are more affordable G-Shocks that deliver excellent value. If you’re buying this, you’re paying partly for ruggedness, materials, prestige, and features. That’s fine if you use those; less so if many features will go unused. Limited “Smartwatch” features It’s not a smartwatch. No notifications, limited to noizable phone alerts, no fitness tracking (steps, heart rate etc.). If you expect those in a “connected” watch, you’ll be disappointed. It’s more tool‑watch + sensor + time keeping + ruggedness, rather than “smartwatch replacement.” My Experience Over 12+ Months Putting together how it’s held up and how I actually use it: * I’ve used it in rain, mud, sand. After sweaty sweaty days in hot sun & humid weather, it still functions beautifully. No issues with fogging or moisture infiltration. * Solar holds up nicely—even in seasons or locations where sun is sparse, the power reserve stays healthy. * The Bluetooth + app still functions well: occasionally a firmware downward tweak, but generally stable. Calibrating sensors via the app has been easier than fiddling with buttons. * The watch feels like it could survive decades of rugged use. The case, crystal, bezel guards still look solid. Some light paint wear/finish wear on button edges, but given how much punishment it’s seen, that’s totally acceptable. * I tend to wear it more than dress watches now, even in urban / work settings, because it gives me peace of mind: “I don’t need to baby this one.” Should You Get One? Who It’s Best For Given everything, I think this watch is worth it, if you fall into one or more of these categories: * You spend a lot of time outdoors (hiking, camping, fishing, construction, fieldwork etc.), and need a rugged, reliable watch with robust sensors. * You appreciate tool‑watches more than fashion watches. Function over frivolity. * You want features like solar charging + radio time sync + compass/altimeter/barometer built in, so that you’re not pulling out multiple devices. * You don’t mind size / bulk; you want toughness and don’t care much about a thin profile. Final Thoughts After over a year, the Casio G‑Shock GWG‑B1000‑1AJF isn’t just good—it’s impressive in nearly every respect it sets out to deliver. The build, durability, sensors, power, and utility justify the cost for those who actually need them. It’s not perfect, but its imperfections are small compared to the strengths. This is a beast of a watch that works as hard as you do, and will keep up through nearly anything you throw at it, and will likely continue to work and survive after a Zombie Apocalypse. ... show more
Reviewed in the United States on September 25, 2025 by Ty
    • Worth the money, different than other GShock watches
Awesome watch… Actually comes from Japan with an instruction book only in Japanese to prove it 😂. Seriously, this is a great solar watch. I work indoors most of the day and the battery is full every time I check it. Very rugged, very stylish for a watch of this type. I get a lot of comments/compliments about it. Buttons on the sides of the watch are protected but large enough to be easy to use. The light 💡 it extremely bright at night.. I have had many Gshock’s over the years but this is the best by far and although it is not cheap I believe that it will last a very long time… ... show more
Reviewed in the United States on December 19, 2025 by Rod Cassidy
    • Construction job. Husband loves it.
Seller included handwritten note. My husband loves it. It's an everyday watch for him and the only thing he's found that holds up to his construction job. This newer version is slimmer.
Reviewed in the United States on October 24, 2025 by shayna
    • Love this watch!
This is my favorite everyday watch. I use it more than my smart watch. Love all the functions that it has, built for durability, and it looks really great. I get compliments all the time on it. Wish the band was a little longer though to accommodate my large wrist since I’m at the second to the last holes. ... show more
Reviewed in the United States on February 19, 2025 by Amazon Customer
    • Great Watch
Love the watch. Better than expected!
Reviewed in the United States on January 7, 2026 by Hadar R.
    • Expensive but a nice watch
Great watch now that I received the correct one. Nicer than I expected. Big watch that wears smaller than it really is.
Reviewed in the United States on July 26, 2025 by CROD
    • Ruggedness
This watch is so rugged are large green wing macaw grabbed onto it, fighting with full force and didn't break it! Great! Great watch!
Reviewed in the United States on September 19, 2025 by Joe
    • This watch is awesome.
Review Image by Rick A Rick A
What can I say that hasn't been said about this beautiful and tough watch. This is my second in the Mudmaster/Mudman series and I can't wait to put it through its paces. I regularly fished in often cold saltwater conditions and never had any issues with it in over 7 years of abuse. It is relatively easy to set up and the tutorials on Youtube make understanding/using it even easier. ... show more
Reviewed in the United States on January 10, 2024 by Rick A Rick A

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