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Casio Men's G-Shock Master of G Mudmaster Carbon Core Guard Quad Sensor Connected Grey Resin Watch GGB100-1A

  • Based on 554 reviews
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Availability: 18 left in stock
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Arrives Wednesday, Jul 30
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Description

From Casio G-Shock, the innovators of tough timekeeping, comes the GGB100 Master of G Mudmaster watch series that has been designed to endure the toughest environments. This watch features a carbon core guard structure case, in black with grey accents, that allows the internal mechanics of the watch to be protected from shock-induced damage. This watch is mud resistant with metal buttons that form a tight seal on the case, a dual back cover that consists of a stainless steel panel back and an outer cover made of shock resistant fine resin embedded with glass fibers, and the bezel has three layers of fine resin with carbon fiber inserts. The Quad Sensor capabilities provide instant access to a compass, altitude/barometer, thermometer, and an accelerometer that keeps track of your step count. Additionally, this watch connects via Bluetooth to a special G-Shock app that helps with the configuration, as well as records altitude data, route information, and step counts. These recordings are used to create an activity log you can use for tracking. Mode Switching Customization allows you to turn on and off individual modes and their sequence, for a personalized feel. This capable watch is finished with a grey resin band. Features of this highly functional watch include:Shock ResistantMud ResistantCarbon Core Guard structure200 meter water resistanceGrey resin bandCarbon and resin caseNeobriteDouble LED lightMobile link (Wireless linking using Bluetooth(R))Digital compassAltimeterAuto log data (High/low altitudes, cumulative ascent and descent)BarometerThermometerStep count using a 3-axis acceleration sensor: 0 to 999,999 step count display rangePower Saving: Auto sensor sleep state entry after fixed period of non-activityWorld time with 38 time zonesSunrise, sunset time display1/100-second stopwatchCountdown timer5 daily alarmsFull auto- calendar (to year 2099)12/24-hour formatAnalog: 3 hands (hour, minute (hand moves every 10 seconds), second)Digital: Hour, minute,

Product Dimensions ‏ : ‎ 5 x 5 x 5 inches; 3.25 ounces


Item model number ‏ : ‎ GGB100-1A


Department ‏ : ‎ mens


Batteries ‏ : ‎ 1 Lithium Metal batteries required.


Date First Available ‏ : ‎ August 5, 2019


Manufacturer ‏ : ‎ Casio


Best Sellers Rank: #329,760 in Clothing, Shoes & Jewelry (See Top 100 in Clothing, Shoes & Jewelry) #1,497 in Men's Wrist Watches


#1,497 in Men's Wrist Watches:


Customer Reviews: 4.6 4.6 out of 5 stars 554 ratings


Brand, Seller, or Collection Name: G-Shock


Metal stamp: Not stamped


Metal: no-metal-type


Setting: no-setting-type


Item Length: 5 inches


Clasp: Tang Buckle


Model number: GGB100-1A


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Wednesday, Jul 30

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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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • Love the watch, app not so much.
The Casio Men's G-Shock Mudmaster GGB100-1A is a true masterpiece of engineering and design, combining rugged durability with advanced features to create a watch that exceeds expectations in every way. From its robust construction to its innovative technology, this timepiece sets a new standard for performance and reliability. One of the standout features of the Mudmaster GGB100-1A is its Carbon Core Guard structure, which provides exceptional durability while keeping the watch lightweight and comfortable to wear. This watch is built to withstand the toughest conditions, making it the perfect companion for outdoor adventures, extreme sports, or everyday wear. Equipped with Quad Sensor technology, including a compass, altimeter/barometer, thermometer, and step tracker, this watch offers a wealth of useful information for outdoor enthusiasts and professionals alike. The connected features allow you to sync the watch with your smartphone for enhanced functionality and customization, adding a new level of convenience to your daily routine. The design of the Mudmaster GGB100-1A is both rugged and stylish, with a grey resin band and case that exude a sense of strength and durability. The large, easy-to-read display is protected by scratch-resistant mineral crystal, ensuring that the watch remains looking great even after years of use in challenging environments. Whether you're a hiker, explorer, or simply someone who appreciates high-quality watches, the Casio Men's G-Shock Mudmaster GGB100-1A is sure to impress. With its exceptional build quality, advanced features, and rugged design, this watch is a five-star product that delivers on all fronts. I highly recommend it to anyone looking for a reliable and feature-packed timepiece that can stand up to whatever challenges come its way. My only drawback is the app. No connectivity for AppleHealth for steps and calories which is ridiculous in 2024. ... show more
Reviewed in the United States on March 18, 2024 by D. Couse

  • Great watch
I have purchased this as a birthday gift for my husband. He absolutely loves it and has all kinds of features. He didn’t want to have an Apple Watch. but he still wanted to watch the had some features. it’s very durable.
Reviewed in the United States on June 3, 2025 by carrie

  • Mudmaster's Delight..
I bought my first Casio G-Shock watch back in the 90's. I've been extremely loyal to the G-Shock brand ever since. Every upgrade and evolution of the G-Shock series always had a strong feel with some weight to them. I was suprised by the lack of weight on the G-Shock Mudmaster GGB100. After reading some of the reviews, I suppose that's a good thing. Overall love my new purchase of the Mudmaster. Still a great watch that will last a very very long time. ... show more
Reviewed in the United States on May 22, 2025 by Manuel Davila Manuel Davila

  • Terrific Watch!
What I needed was a highly durable watch, very easy to read, with no hassle in keeping it on the correct date and time. This watch meets all of the criteria and looks very nice! The ability to synchronize this watch to my iPhone with the Casio App turned out to be exceptionally useful and very helpful. I was concerned that this watch did not have a solar battery; however, I am actually getting more use out of it with a regular battery which simply needs to changed out, approximately every two years. You will love this watch! ... show more
Reviewed in the United States on December 6, 2023 by Seeker707

  • Great watch
I was sick of having to charge up my other "smart" watch, thus I wanted something that had a regular battery, a traditional watch face and a step counter...not easy to find.....This casio Mud resist, ticked off all those boxes! It feels solid and looks sharp. The watch face is huge, took some adjusting, but no issues with the fit. Came in the box and tin. Very happy with the purchase. ... show more
Reviewed in the United States on June 3, 2024 by flames9

  • Awesome watch
Great watch
Reviewed in the United States on March 23, 2025 by marc connors

  • Watch locks up. Firmware is jacked!! Hands and light stop working.
There is truly something wrong with the firmware and bluetooth connect. GShock Connect is moving to a Casio App. You constantly get encouraged to switch Apps. The watch literally locked up in the Bluetooth mode. No matter reset.. changin apps.. disconnecting bluetooth. I went through every setting short of taking the battery out... which all online forums said to do. I had this watch one day and the software and watch function crashed so bad... it would not... still will not work. The hands stopped working. The watch light stopped working. This issue is all over the internet. I cant believe they are still selling this and promoting the app. And it wont fulfill the functions it was made to do without the app. Im disappointed in GShock. And disappointed Amazon has such high reviews. Im a Veteran. Ive used GShock for over 20 years. This watch is gorgeous... but FUBAR. Its a heartache to say so. ... show more
Reviewed in the United States on December 28, 2023 by Eric Pounders

  • fits perfect
fast service great product
Reviewed in the United States on June 25, 2025 by JAM

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