G-Shock GM-B2100D-1AER Watch - Classic
The Casio GM-2100-1A G-Shock Metal Covered wristwatch combines a stainless steel case with a durable black plastic strap, offering a resilient men's watch. It features an analog-digital display with a gray dial, luminous hands and indices for better visibility in low light conditions, as well as a mineral glass for scratch resistance. Key functions include world time, a 1/100-second stopwatch, countdown timer, fully automatic calendar with day and date display, hourly time signal, and dual LED lighting. With a water resistance of 200 meters, it is suitable for swimming and snorkeling. The case measures approximately 44 mm in diameter and 12 mm in thickness, with a band width of 16 mm, and features a screw-down case back and a pin buckle for secure comfort. This model emphasizes reliability and practicality under demanding conditions.
The Casio GM-2100-1A G-Shock Metal Covered wristwatch combines a stainless steel case with a durable black plastic strap, offering a resilient men's watch. It features an analog-digital display with a gray dial, luminous hands and indices for better visibility in low light conditions, as well as a mineral glass for scratch resistance. Key functions include world time, a 1/100-second stopwatch, countdown timer, fully automatic calendar with day and date display, hourly time signal, and dual LED lighting. With a water resistance of 200 meters, it is suitable for swimming and snorkeling. The case measures approximately 44 mm in diameter and 12 mm in thickness, with a band width of 16 mm, and features a screw-down case back and a pin buckle for secure comfort. This model emphasizes reliability and practicality under demanding conditions.
The Casio GM-2100-1A G-Shock Metal Covered wristwatch combines a stainless steel case with a durable black plastic strap, offering a resilient men's watch. It features an analog-digital display with a gray dial, luminous hands and indices for better visibility in low light conditions, as well as a mineral glass for scratch resistance. Key functions include world time, a 1/100-second stopwatch, countdown timer, fully automatic calendar with day and date display, hourly time signal, and dual LED lighting. With a water resistance of 200 meters, it is suitable for swimming and snorkeling. The case measures approximately 44 mm in diameter and 12 mm in thickness, with a band width of 16 mm, and features a screw-down case back and a pin buckle for secure comfort. This model emphasizes reliability and practicality under demanding conditions.
The Casio GM-2100-1A G-Shock Metal Covered wristwatch combines a stainless steel case with a durable black plastic strap, offering a resilient men's watch. It features an analog-digital display with a gray dial, luminous hands and indices for better visibility in low light conditions, as well as a mineral glass for scratch resistance. Key functions include world time, a 1/100-second stopwatch, countdown timer, fully automatic calendar with day and date display, hourly time signal, and dual LED lighting. With a water resistance of 200 meters, it is suitable for swimming and snorkeling. The case measures approximately 44 mm in diameter and 12 mm in thickness, with a band width of 16 mm, and features a screw-down case back and a pin buckle for secure comfort. This model emphasizes reliability and practicality under demanding conditions.
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The lowest price for G-Shock GM-B2100D-1AER Watch - Classic right now is $456.00 at Chrono24.com.au, compared across 7 retailers.
The all-time low was $456.00 on 19 July 2026. That's the lowest price we've ever tracked — a great time to buy.
Prices last updated 19 July 2026.
Last updated at 19/07/2026 03:02:33
Casio GM-B2100D-1AJF
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Casio GM-B2100SD-1AJF Steel 49.8x44.4mm
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Casio G-Shock GM-B2100D-1AJF Steel Black 49.8x44.4mm 2026
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Casio Gm-b2100 Case Size 4 ×4.3cm Wrist Size 18cm Used Watch 113314
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Casio G-shock Gm-b2100 Wrist Size 17cm Used Watch 812611
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Casio G-shock Gm-b2100 Wrist Size 17cm Used Watch 812611
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 Gm−b2100 Gm-b2100 Used Watch Excellent Condition
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Casio Gm-b2100 Case Size 4.9 ×4.5cm Wrist Size 19cm Used Watch 314331
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Casio Wristwatch Shock Full Metal Gm B2100 1ajf Bluetooth Smartphone
Delivery $55.16
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originally posted on g-shock.co.uk
I already owned the 2100 stealth so was very interested when the ‘metal’ version was released. Again I went for the ‘stealth’ version and have not been disappointed. The watch face is delightful and build quality is superb. Easy to adjust the bracelet for my wrist and a lovely weight.Overall a beautiful watch. If you like the original ‘Casioak’ you will not be disappointed
originally posted on g-shock.co.uk
I had my last g shock for over 19 years and although it was starting to look old it was still going strong.I found this while searching for a watch for my son. The design is fantastic it looks great. Being able to set it all up on the smartphone app along with tough Solar so no need to worry about changing batteries either.I am looking forward to another 19 years or even more with this beauty on my wrist.
originally posted on g-shock.co.uk
Finally got my 'Casio grail' - I already own (and love!) the resin version of this but wanted the luxury feel of the full metal model. Managed to try one on in H Samuel and the very patient sales lady spent ages with me ensuring I was happy with the fit. In fact, despite being a large watch, it's actually more comfortable on the wrist than my resin version (which surprised me). The fit and finish is superb as is the high quality bracelet with a milled clasp and plenty of micro adjustment. The only (slight) negative is it can be hard to read in certain lights but it does have decent lume (including the indices on this model) and a good double LED light. Pairs easily with the app, adding a second watch was easy enough and it synched perfectly with it. This will be my ... MoreFinally got my 'Casio grail' - I already own (and love!) the resin version of this but wanted the luxury feel of the full metal model. Managed to try one on in H Samuel and the very patient sales lady spent ages with me ensuring I was happy with the fit. In fact, despite being a large watch, it's actually more comfortable on the wrist than my resin version (which surprised me). The fit and finish is superb as is the high quality bracelet with a milled clasp and plenty of micro adjustment. The only (slight) negative is it can be hard to read in certain lights but it does have decent lume (including the indices on this model) and a good double LED light. Pairs easily with the app, adding a second watch was easy enough and it synched perfectly with it. This will be my Christmas present off my Dad and I'm so happy to end 2022 with this iconic watch on my wrist!
| Diameter | 44.4 mm |
| Water Resistance | 20 Bar (Dive) |
| Warranty | 2 Year Warranty |
| Time | hours - Digital - Analogue hand |
| Calendar | Date - Digital |
Casio GM-B2100D-1AJF
Free delivery
Casio GM-B2100SD-1AJF Steel 49.8x44.4mm
Free delivery
Casio G-Shock GM-B2100D-1AJF Steel Black 49.8x44.4mm 2026
Free delivery
Casio Gm-b2100 Case Size 5 ×4.5cm Wrist Size 13.5cm Used Watch 31434
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 Gm-b2100 Case Size 4 ×4.3cm Wrist Size 18cm Used Watch 113314
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!
I already owned the 2100 stealth so was very interested when the ‘metal’ version was released. Again I went for the ‘stealth’ version and have not been disappointed. The watch face is delightful and build quality is superb. Easy to adjust the bracelet for my wrist and a lovely weight.Overall a beautiful watch. If you like the original ‘Casioak’ you will not be disappointed
I had my last g shock for over 19 years and although it was starting to look old it was still going strong.I found this while searching for a watch for my son. The design is fantastic it looks great. Being able to set it all up on the smartphone app along with tough Solar so no need to worry about changing batteries either.I am looking forward to another 19 years or even more with this beauty on my wrist.
Finally got my 'Casio grail' - I already own (and love!) the resin version of this but wanted the luxury feel of the full metal model. Managed to try one on in H Samuel and the very patient sales lady spent ages with me ensuring I was happy with the fit. In fact, despite being a large watch, it's actually more comfortable on the wrist than my resin version (which surprised me). The fit and finish is superb as is the high quality bracelet with a milled clasp and plenty of micro adjustment. The only (slight) negative is it can be hard to read in certain lights but it does have decent lume (including the indices on this model) and a good double LED light. Pairs easily with the app, adding a second watch was easy enough and it synched perfectly with it. This will be my ... MoreFinally got my 'Casio grail' - I already own (and love!) the resin version of this but wanted the luxury feel of the full metal model. Managed to try one on in H Samuel and the very patient sales lady spent ages with me ensuring I was happy with the fit. In fact, despite being a large watch, it's actually more comfortable on the wrist than my resin version (which surprised me). The fit and finish is superb as is the high quality bracelet with a milled clasp and plenty of micro adjustment. The only (slight) negative is it can be hard to read in certain lights but it does have decent lume (including the indices on this model) and a good double LED light. Pairs easily with the app, adding a second watch was easy enough and it synched perfectly with it. This will be my Christmas present off my Dad and I'm so happy to end 2022 with this iconic watch on my wrist!
In my opinion certainly this is beautiful well crafted watchBut there is a big problem with the watch design -can not see hand and indices and it is dark you can't see time which is most important thing for any watch to read the time and that is whole and main purpose of the any watch and one of the fundamental horological watch making principlesDesigner like headless checked made a huge mistake by making watch look like a dark faced smart watchWhat an idiotic design!I am in the process of writing to top executives at Casio in Japan about thisWasted my time and caused me lot of inconvenienceFelt sorry to return this watch
I bought this as a work watch and it is functional yet smart, with a good looking face and a nice colour on the metalwork.The functions are easy to use and the light is ok (for a g-shock).But who designed the app??? If I have paid for a watch which uses an app to adjust the time and stays connected to the watch I expect get just that. I don't care about Instagram or which overhyped 'influencer' is wearing your product. I don't want to have to resync and re-select my watch every time. G-Shock make good, wearable watches, the solar power seems to be working well - sort out the app!!
The watch itself is excellent, well designed and beautifully finished. The mobile phone connection is a different matter, this model of watch is not listed and consequently the watch is not automatically updated meaning l have to spend time doing it manually. Hopefully this will be fixed soon as it is a new model of watch.
I ordered this direct from this store with a 10% discount saving. Beautiful watch on the wrist. Bracelet and case has stunning polishing and finishing - they look far superior to the resin models. Really comfortable to wear and amazing day-to-day watch. This watch has me putting my expensive Swiss automatics away in a drawer! Highly recommended.
My first g shock, and I've mixed feelings.GoodAll metalGreat looks and feel on the wristGreat functions (see bad)BadPoor legality in anything but bright daylight.Awfull app takes 3 to 4 attempts to connect.On balance its OK but would need to be convinced to get another g shock.
I was torn between black and silver. I’m so glad I went for black! The black in real life is very light coloured and shiny (more so than in the G Shock stock images - google some unboxing videos to see) so reflects the light brilliantly. For me it is the perfect combination of both. Really nice watch.
Well built, like all G-Shock watches. The only downside is the dial’s less than ideal legibility, especially in poor lighting conditions. I assume the design concept was “stealth”, however, the rest of the watch is far from “stealthy”. The polishing methods used make the bracelet and case visible from afar. Considering this, the dial could’ve used some more contrast. Perhaps something as simple as white hands and markers.
| Diameter | 44.4 mm |
| Water Resistance | 20 Bar (Dive) |
| Warranty | 2 Year Warranty |
| Time | hours - Digital - Analogue hand |
| Calendar | Date - Digital |
