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The Casio G-SHOCK GMC-B2100 is a full-metal, fully analog chronograph in the octagonal 2100 style. It pairs a stainless-steel case and bracelet with Tough Solar charging and Bluetooth Mobile Link for automatic time adjustment through the CASIO WATCHES app. Casio announced it on September 30, 2024; launch prices and availability varied by market and are historical, not current retail guidance.
What is the GMC-B2100?
Casio positions the GMC-B2100 as a full-metal chronograph within the 2100-style G-SHOCK family. The original GA-2100, introduced in 2019, combined analog and digital displays; the GMC-B2100 takes a different approach with an all-analog display and three functional inset dials. Its octagonal bezel retains the family’s recognizable shape. Casio’s September 30, 2024 announcement describes the design and launch.
![Casio GM-B2100BD-1AJF [G-Shock GA-2100 Series Full Metal Model with Smartphone Link] Men's Watch Shipped from Japan Aug 2022 Model](https://m.media-amazon.com/images/I/41NKkEMv0-L._SL160_.jpg)
![Casio GM-2100BB-1AJF [G-Shock (G-Shock) Metal Covered Series Blackout] Watch Imported from Japan Feb 2023 Model, Black, Mens, Black, Modern](https://m.media-amazon.com/images/I/41YV+AJKF6L._SL160_.jpg)
Casio says the bezel top and band have a hairline finish, while the sloped sides of the bezel are mirror polished. The screw-lock crown is octagonal to echo the bezel. These are the manufacturer’s design descriptions; they are not independent assessments of the finish.
What features does it have?
Solar charging and Bluetooth
Tough Solar charges the watch using light. Bluetooth Mobile Link connects it to a smartphone, where the CASIO WATCHES app can adjust the time automatically and provide watch settings, world-time configuration, alarms, Time & Place, and Phone Finder. Casio lists approximately 300 world time cities in the app. These phone-linked functions require the CASIO WATCHES app; the watch also lists dual time as a function. See the official GMC-B2100D-1A product page for the current specification listing.
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![Casio GM-B2100GD-9AJF [G-Shock (G-Shock) Full Metal Model with Smartphone Link GM-B2100 Yellow Gold Color Model] Watch Japan Import March 2023 Model](https://m.media-amazon.com/images/I/51R5kAE7MML._SL160_.jpg)
- G-SHOCK is a shock-resistant clock that builds a new concept of toughness on the watch. It is a full metal model equipped with a smartphone link in the digital/analog combination ''GA-2100'' series developed after inheriting the concept of the first model DW-5000C.
- [Shock-resistant structure] G-SHOCK's core technology in pursuit of toughness is resistant to shocks that protect the module with a unique uneven shape, preventing direct impact on glass & buttons.
- [20 aThesis waterproof] A variety of places & situations can be used, such as daily water work, swimming, surfing, jet skiing, etc.
- [Mobile link function] Compatible mobile phones can be linked by Bluetoothⓡ communication.
- [Other product specifications] Tough solar/needle evacuation function/World time/stopwatch/timer/time alarm/battery indicator display/power saving function/full auto calendar/12/24 hours display switching/operation sound ON/OFF switching/date switch/date Display / day display / double LED light
Chronograph and everyday functions
The stopwatch measures in one-second increments and includes elapsed-time and split-time modes. Other listed functions include a 24-hour countdown timer, daily alarm, full auto-calendar through 2099, battery-level indication, and power saving. A white Super Illuminator LED provides afterglow for low-light reading.
Accuracy and battery operating time
Casio specifies accuracy of ±15 seconds per month when Mobile Link is not used. Its listed operating times are approximately five months under normal use without further light after a charge, or approximately 18 months in total darkness with power saving enabled after a full charge. These are Casio’s stated figures, not independent test results.
Rank #2
Case, materials, and water resistance
For the GMC-B2100D-1A, Casio lists a stainless-steel case and bezel, stainless-steel solid band, mineral glass, and screw-lock crown. The case measures 51.3 × 46.3 × 12.4 mm and the listed weight is 171 g. Water resistance is rated at 200 meters. Casio identifies it as shock resistant and says resin buffering components between the bezel and case help absorb impacts to the module. These specifications come from Casio’s product page and have not been independently tested here.
GMC-B2100D and GMC-B2100AD: what differs?
The launch models differ in dial treatment and in their market-specific model codes and prices. Casio’s D-1A product page lists a black dial, while its AD-2A product page identifies a light-blue dial treatment. The available product information does not establish that the core dimensions or functions differ by color, so check the precise regional model listing before comparing variants.
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Rank #3
Casio’s Japanese announcement named GMC-B2100D and GMC-B2100AD, with suggested retail prices including tax of ¥104,500 and ¥107,800, respectively, and a Japanese release date of October 29, 2024. In separate German-market launch material, Casio Europe listed recommended prices of €799 for GMC-B2100D-1AER and €829 for GMC-B2100AD-2AER, with availability from October 18, 2024 through Casio Germany and selected specialist retailers. Those are historical, market-specific launch details—not current prices or evidence of present stock. See the Japanese announcement and Casio Europe’s German-market launch material.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to compare it with another 2100-series watch
The GMC-B2100 is not simply a metal version of every other 2100 model: its display and chronograph layout are part of the distinction. For a useful comparison, check the exact model pages for these factors:
- Display: fully analog on the GMC-B2100, versus analog-digital on the original GA-2100.
- Materials and weight: confirm whether the case and band are resin, metal, or a combination, and compare the listed weight.
- Size and crystal: compare case dimensions and glass type rather than assuming they are shared across the family.
- Power and connectivity: check for Tough Solar and Bluetooth Mobile Link, as these affect charging and phone-linked functions.
- Water resistance and local price: verify the specific model and regional listing; launch pricing does not establish current retail pricing.
These comparison points clarify the trade-offs without implying that one watch is universally better. The right choice depends on whether the reader prefers an analog-only chronograph, the materials and dimensions, and the features offered by the exact model under consideration.
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Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
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