G-Shock GG-B100-1A9ER Watch - Mudmaster
This is a model from the G-Shock Mudmaster Series, designed for use in extreme environments scattered with rubble, dirt and debris, and uses carbon materials. The use of high rigidity carbon on the case keeps damage and deformation at bay, and ensures a high level of airtightness and shock resistance. This model also features a filter that protects against the invasion of mud, a stainless steel panel back, and a back cover made of shock-resistant fine resin embedded with glass fibers, giving it a high level of resistance to dust and mud. The bezel also uses three layers of fine resin with carbon fiber inserts and is designed to resemble a portable gasoline can that could be found on off-road vehicles. Function-wise, this model comes with compass, altimeter/barometer, temperature reader and pedometer. In addition to being able to easily correct the time using the dedicated CASIO WATCHES app, there are lots of other useful features including the Mission Log feature, which automatically records in the app altitude data obtained from the watch and route data obtained by your smartphone. This is a toughness watch that supports you in taking quick decisions and accurate actions.
This is a model from the G-Shock Mudmaster Series, designed for use in extreme environments scattered with rubble, dirt and debris, and uses carbon materials. The use of high rigidity carbon on the case keeps damage and deformation at bay, and ensures a high level of airtightness and shock resistance. This model also features a filter that protects against the invasion of mud, a stainless steel panel back, and a back cover made of shock-resistant fine resin embedded with glass fibers, giving it a high level of resistance to dust and mud. The bezel also uses three layers of fine resin with carbon fiber inserts and is designed to resemble a portable gasoline can that could be found on off-road vehicles. Function-wise, this model comes with compass, altimeter/barometer, temperature reader and pedometer. In addition to being able to easily correct the time using the dedicated CASIO WATCHES app, there are lots of other useful features including the Mission Log feature, which automatically records in the app altitude data obtained from the watch and route data obtained by your smartphone. This is a toughness watch that supports you in taking quick decisions and accurate actions.
This is a model from the G-Shock Mudmaster Series, designed for use in extreme environments scattered with rubble, dirt and debris, and uses carbon materials. The use of high rigidity carbon on the case keeps damage and deformation at bay, and ensures a high level of airtightness and shock resistance. This model also features a filter that protects against the invasion of mud, a stainless steel panel back, and a back cover made of shock-resistant fine resin embedded with glass fibers, giving it a high level of resistance to dust and mud. The bezel also uses three layers of fine resin with carbon fiber inserts and is designed to resemble a portable gasoline can that could be found on off-road vehicles. Function-wise, this model comes with compass, altimeter/barometer, temperature reader and pedometer. In addition to being able to easily correct the time using the dedicated CASIO WATCHES app, there are lots of other useful features including the Mission Log feature, which automatically records in the app altitude data obtained from the watch and route data obtained by your smartphone. This is a toughness watch that supports you in taking quick decisions and accurate actions.
This is a model from the G-Shock Mudmaster Series, designed for use in extreme environments scattered with rubble, dirt and debris, and uses carbon materials. The use of high rigidity carbon on the case keeps damage and deformation at bay, and ensures a high level of airtightness and shock resistance. This model also features a filter that protects against the invasion of mud, a stainless steel panel back, and a back cover made of shock-resistant fine resin embedded with glass fibers, giving it a high level of resistance to dust and mud. The bezel also uses three layers of fine resin with carbon fiber inserts and is designed to resemble a portable gasoline can that could be found on off-road vehicles. Function-wise, this model comes with compass, altimeter/barometer, temperature reader and pedometer. In addition to being able to easily correct the time using the dedicated CASIO WATCHES app, there are lots of other useful features including the Mission Log feature, which automatically records in the app altitude data obtained from the watch and route data obtained by your smartphone. This is a toughness watch that supports you in taking quick decisions and accurate actions.
in 27 offers
The lowest price for G-Shock GG-B100-1A9ER Watch - Mudmaster right now is $282.36 at eBay.com.au, compared across 12 retailers.
The all-time low was $282.36 on 17 Aug 2026. That's the lowest price we've ever tracked — a great time to buy.
Prices last updated 20 Aug 2026.
Last updated at 20/08/2026 13:35:56
Casio G-shock Gg-b100-1a9 Mudmaster Carbon Core Guard Quad Sensor
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Casio G-shock Gg-b100-1a9jf Mudmaster For Men From Japan
Delivery $30.94
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Casio G-shock Gg-b100-1a9jf Mudmaster For Men From Japan
Delivery $30.94
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Casio G-shock Gg-b100-1a9jf Mudmaster For Men From Japan
Delivery $16.92
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Casio G-shock Gg-b100-1a9jf Mudmaster For Men From Japan
Delivery $15.68
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Casio G-shock Gg-b100-1a9jf Mudmaster For Men From Japan
Delivery $30.94
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Casio G-shock Gg-b100-1a9jf Mudmaster For Men From Japan
Delivery $16.92
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Casio G-shock Mudmaster Gg-b100-1a9jf Carbon Core Guard Orange Watch
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Casio G-shock Mudmaster Gg-b100-1a9jf Carbon Core Guard Orange Watch
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[used Excellent]casio G-shock Gg-b100-1a9jf Mudmaster Carbon Triple
Delivery $23.21
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originally posted on casio.com
We were disappointed when we bought a G Shock watch from Amazon a few years ago to find out that it was a fake after trying to replace a battery at a watch store. So we were super thankful that we were able to finally find & purchase a watch from the Casio G Shock on line site. I love the G Shock watches. They are durable, rugged, well designed; and very well made. I hope that my new wtach will last a long time. Keep up the great work!
originally posted on ebay.com
Casio G shock watches are my favorite everyday watch for many years now! It started when I worked in construction and needed a rugged watch that could take a beating! This brand did! I have owned a few only because they lasted so long! Now that I am retired I decided to get a new Mudmaster GShock with Bluetooth so setting it with a phone app makes it easy! Best one yet!
originally posted on g-shock.co.uk
Bought this for my husbands Christmas, he loves it. Between the bright light on the screen, the ease he’s had changing the time when he’s traveled and syncing his phone with it. This is the 2nd GShock I’ve bought him, it’s brilliant for his hands on jobs, won’t and hasn’t been damaged. It’s sturdy and durable for all weathers as he’s found. He also loves the step counter, having never had a watch that does it before.
| Model Specifications | GG-B100-1A9ER |
Casio G-shock Gg-b100-1a9 Mudmaster Carbon Core Guard Quad Sensor
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Casio G-shock Gg-b100-1a9jf Mudmaster For Men From Japan
Delivery $30.94
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Casio G-shock Gg-b100-1a9jf Mudmaster For Men From Japan
Delivery $30.94
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Casio G-shock Gg-b100-1a9jf Mudmaster For Men From Japan
Delivery $16.92
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Casio G-shock Gg-b100-1a9jf Mudmaster For Men From Japan
Delivery $15.68
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
We were disappointed when we bought a G Shock watch from Amazon a few years ago to find out that it was a fake after trying to replace a battery at a watch store. So we were super thankful that we were able to finally find & purchase a watch from the Casio G Shock on line site. I love the G Shock watches. They are durable, rugged, well designed; and very well made. I hope that my new wtach will last a long time. Keep up the great work!
Casio G shock watches are my favorite everyday watch for many years now! It started when I worked in construction and needed a rugged watch that could take a beating! This brand did! I have owned a few only because they lasted so long! Now that I am retired I decided to get a new Mudmaster GShock with Bluetooth so setting it with a phone app makes it easy! Best one yet!
Bought this for my husbands Christmas, he loves it. Between the bright light on the screen, the ease he’s had changing the time when he’s traveled and syncing his phone with it. This is the 2nd GShock I’ve bought him, it’s brilliant for his hands on jobs, won’t and hasn’t been damaged. It’s sturdy and durable for all weathers as he’s found. He also loves the step counter, having never had a watch that does it before.
Added this one to my G-Shock collection. Nice gray colors and goes well with most anything. Quality is excellent. Like all G-Shocks, it is chunky, but fits well and looks great. Note for all of you collectors. CASIO is no longer using the plastic protective bags in their tins. They are stuffing the watches into the foam without any protective barrier. When the foam rubs against the flat black features of the watch it produces shiny spots on them, which makes the watch look very used to start with. I had to send back another style, due to this. I contacted CASIO and they indicated, that they dropped the bags due to environmental concerns. This is too bad, as the way they are doing it now, is damaging their products. Time will tell on customer complaints and sales.
All functions you need work as it should, not question about it. Wait, that's not right.The sensor is not very responsive. The temperature sensor doesn't change much when move from inside 75 F degree to outside 45 F degree. After 30 minutes outside with exposing the watch in the air, it's still 6x something when our wall digital thermometer tell me it's 4x something.....I also have a problem to correct the long hand. No matter how I adjust it, it's always 20 minutes behind the digital time. The APP is dysfunction when try to set the time. Emailed to the customer service, the response makes me feel it's my poor operation that I cannot correct the issue. Too shame to claim a warranty so I wear this watch with 20minutes behind the real time..... Worry about the wife ... MoreAll functions you need work as it should, not question about it. Wait, that's not right.The sensor is not very responsive. The temperature sensor doesn't change much when move from inside 75 F degree to outside 45 F degree. After 30 minutes outside with exposing the watch in the air, it's still 6x something when our wall digital thermometer tell me it's 4x something.....I also have a problem to correct the long hand. No matter how I adjust it, it's always 20 minutes behind the digital time. The APP is dysfunction when try to set the time. Emailed to the customer service, the response makes me feel it's my poor operation that I cannot correct the issue. Too shame to claim a warranty so I wear this watch with 20minutes behind the real time..... Worry about the wife would fine out and kick my butts.....for spending near $400 USD for an inaccurate watch..... what else can i say.....
Amazing watch! I currently live in a council estate in Nepal. I ordered this watch as casio has always brot happy nes to my life. But unfortunately when the watch arrived it was in mint condition, i was thinking after spending ¥200000000000000000000000000 it would’ve been second hand. I am not happy with my amazing watch as i really needed it to help my family flourish in the Nepalese mountain range. Because of this watch being so brilliant my family are going to be executed by the NYPD.
What a brilliant watch, functions are brilliant, the watch looks great, definitely a great comfortable watch to wear. Why only 3 stars, the strap. I decided to buy the orange strap watch as it stood out but unfortunately this is the issue. In a short space of time the strap has become discoloured, dull and looks dirty. I cleaned the strap after wearing the watch every time but no joy. I contacted Casio who told me this is what happens. So overall an outstanding watch but just dont buy the orange strap version.
Well, what to say about this watch... other than it is pretty awesome!I have a few G-Shock watches now, ranging from the tiny Pikachu Baby-G to the beast that is the GWG-1000 MudMaster, the GG-B100 sits on my wrist more than the others now and is very worthy of the MudMaster name. It shares a lot of the features with it's big brother but has plenty more on top, in some cases it even betters its brother! For example, the barometer function, this watch can show you over 2 days worth of data (the GWG only shows 1 day), much better to see changes in the weather. I also find the thermometer to be better as you don't have direct contact with a metal case back as it has a resin cover. Then of course there is the step tracking function that can record your daily steps ... MoreWell, what to say about this watch... other than it is pretty awesome!I have a few G-Shock watches now, ranging from the tiny Pikachu Baby-G to the beast that is the GWG-1000 MudMaster, the GG-B100 sits on my wrist more than the others now and is very worthy of the MudMaster name. It shares a lot of the features with it's big brother but has plenty more on top, in some cases it even betters its brother! For example, the barometer function, this watch can show you over 2 days worth of data (the GWG only shows 1 day), much better to see changes in the weather. I also find the thermometer to be better as you don't have direct contact with a metal case back as it has a resin cover. Then of course there is the step tracking function that can record your daily steps when using the G-Shock app on your phone. And when you do pair up with your phone a whole new bag of tricks is opened up for you.. from regular timekeeping updates to being able to record your location and then finding your way back using the watch, showing which direction and how far away, without having to take your phone out of your pocket/rucksack. Not to mention how much easier the app makes setting nearly all of the watch functions. I suppose I had better talk about how it looks.. I chose the orange version (1A9ER iirc), it looks stunning, then again all 3 versions do. It fits in nicely with the MudMaster range but slightly smaller than it's big brothers and the carbon fibre bezel looks very swish, the glass is domed which helps with any sunlight reflecting. Lume is pretty good, but should you need more light, the led light is amazing, it is literally the equivalent of shining a torch on the watch face! Fit wise, I have 8 inch wrists and the strap is plenty long, long enough that the tail end can still be held neatly down by the keeper. I barely notice the weight on my wrist, it is very comfortable to wear.tl;dr .... buy it now, it is awesome... oh and delivery was top notch, next working day and VERY well packed! Thanks!
Struggle with readings. Letters and numbers should be darker shade. Overall, a pretty decent watch. Strap should have more of a natural feel. To much plastic for my liking. Also for the money, quite disappointed that it's not solar. My other g shock watches are, and so so much cheaper. Don't really understand that one. Quite disappointed to be honest. Expected so much more. Sorry for the honesty. 👍 Let's hope, that the other top end models become cheaper in the near future. Would definetly consider another. Will always be checking and looking to see if any deals are available. My other purchases are fantastic. Casio produce some of the best looking, hard wearing watches throughout. Thankyou casio. Hopefully will purchase soon. Waiting for that special moment. . ... MoreStruggle with readings. Letters and numbers should be darker shade. Overall, a pretty decent watch. Strap should have more of a natural feel. To much plastic for my liking. Also for the money, quite disappointed that it's not solar. My other g shock watches are, and so so much cheaper. Don't really understand that one. Quite disappointed to be honest. Expected so much more. Sorry for the honesty. 👍 Let's hope, that the other top end models become cheaper in the near future. Would definetly consider another. Will always be checking and looking to see if any deals are available. My other purchases are fantastic. Casio produce some of the best looking, hard wearing watches throughout. Thankyou casio. Hopefully will purchase soon. Waiting for that special moment. . Fingers crossed!
Really love this watch. Looks great. Lot of features. Ive had it for about 18 months. Battery is completely shot. Was having issues with it for a few months. Fifured i just needed to wear it outside more. Now it doesnt work at all. I purchased protection on it. Going to see if theyll replace it.
| Model Specifications | GG-B100-1A9ER |
