| Size | ★★★★ |
| Weight | ★ |
| Functions | ★★★★★ |
| Materials | ★★★★ |
| Price | ★★ |
GM-B2100 Model Range *may be updated
Quick Content Guide
- GM-B2100 Model Range *in different colors and bands
- General information about the watch *year of first release, model range etc.
- Enjoy Japanese Unique Features in GM-B2100! *key features of GM-B2100 series
- G-Shock GM-B2100 Display Guide *for key functions only
- G-Shock GM-B2100 on the wrist *only images and only on the wrist
- GM-B2100 Usage Patterns *what the watch is usually meant for
- G-Shock GM-B2100 Watch Review *our detailed review of the watch
- Other G-Shock GA Watches *similar by price and functions but different by cases
- Official GM-B2100 Specs *all details and for base version GST-B400-1A
- G-Shock GM-B2100 PROs & CONs *by experts with 10 years experience
- GM-B2100 Comparison Table *with similar G-Shock Watches
- Recent News about GM-B2100 *the latest breaking news and videos
General Information
| Price | $500 *average Amazon Price, we may earn commission from purchases |
| Year of first Release | 2022 |
| Suitable for Wrist Size | 150 – 205 mm |
| Module Number | 5691 / Manual |
| Model Range | Octagon |
| Battery Type | Solar (G-Shock Batteries) |
| Other Divisions the GA-B2100 belongs to: *you may find all watches of the division by clicking on the link | G-Shock Ana-Digi G-Shock Bluetooth G-Shock For Small Wrists G-Shock Solar G-Shock 2022 |
Enjoy Japanese Unique Features in GM-B2100!
A FULL-METAL ANALOGUE WATCH.
Now in a full-metal construction, this 2100-line watch features an octagonal form inherited from the DW-5000C, the very first G-SHOCK that debuted in 1983. With its screw-back case, bezel and band crafted with stainless steel, the watch offers a streamlined, minimalist design while protecting the module from drops and impacts with its iconic G-SHOCK shock-resistant structure. With its tough, dimensional forged form, the bezel shines with an attractive circular hairline finish on its top surface. Reproducing the dimpled portions of the DW-5000C in metal, the band presents enhanced textures with differentiated hairline and mirror finishes.
SLIMLINE MODULE DESIGN
Employing a slim Tough Solar powered timekeeping module with Bluetooth® connectivity, the watch maintains the same sense of size as the previous GM-2100 while offering a wider range of functions and full-metal construction. While delivering high utility with Smartphone Link and Tough Solar functionality, the GM-B2100 offers a comfortable fit on the wrist as well.
FULL-METAL SHOCK-RESISTANT STRUCTURE
Buffering components made of fine resin are installed between the stainless-steel bezel and case to protect the module from shock. Undergoing meticulous processes of forging, cutting, and polishing, the bezel and case are precisely crafted down to the intricately shaped face, and also to the back, which is the key to the precision fit. Additionally, a three-pronged structure is employed for the lugs on the case to disperse shock to the connective part of the band.
DIAL FINISHING ACHIEVED WITH MICROFABRICATION TECHNOLOGY
Dual-layer dial construction is employed to present the inset dial and LCD portion with distinct finishes of their own. With a minute grind-mark finish and vapour deposition applied to the inset dial ring, laser welding used to secure it to the dial, and more, precision die moulding technologies applied by Yamagata Casio deliver an intricate form and meticulously detailed surface finish. In addition, the vapour deposition applied to the dimensional index marks and the indicator hand emphasises the metallic texture for a dial design that complements the watch’s metal exterior.
THREE DISTINCTIVE IP COLOURS FOR FULL-METAL DESIGN
In addition to brilliantly gleaming silver (GM-B2100D), two other options are offered: all-black IP for an intrepid look (GM-B2100BD) and fashionable rose gold IP (GM-B2100GD).
SOLAR POWER
Solar-powered timekeeping with Bluetooth® for enhanced accuracy and reliability
SUPER ILLUMINATOR
Super Illuminator (high-brightness double LED light) for maintaining watch readability in the dark
G-Shock GM-B2100 Display Guide *for key functions only. For you to know how it works))
General Display
- Hour hand
- Minute hand
- Mode hand
Indicates the current mode. In the Timekeeping mode, this hand shows the current charge level. - LCD
Shifting Hands to Read the Digital Display
Hand shift moves the hands out of the way for easy viewing of display information.
Phone Finder
You can use phone finder to trigger a tone on the phone to make it easy to find. The tone is forced to sound even if the phone is in vibrate mode.
Checking World Time
Enter the World Time.
After the currently selected World Time City name appears, the watch will display the current time in that city.
G-Shock GM-B2100 on the wrist!
GM-B2100 Usage Patterns *what the watch is usually meant for
Enjoy our G-Shock GM-B2100 Watch Review
GM-B2100 just managed to combine all these three features into a single image. That’s why I can’t call the GM-B2100 a highly expected release. The emergence of such a creation was quite a logical consequence. The Japanese learned how to play with metal, and tested BLUETOOTH in earlier versions, which means it’s time to flood the market with popular G-SHOCK designs, but with new technologies inside. It’s time to change something because you are not going to sell the DW-5600s for the rest of your life [considering the fast technology development]. However… Who knows… Read Full Review →
What we like in GM-B2100 *comments by experts with 10 years experience in writing about Casio watches
— Full-metal construction (With its screw-back case, bezel and band crafted with stainless steel, the watch offers a streamlined, minimalist design while protecting the module from drops and impacts with its iconic G-SHOCK shock-resistant structure)
— Retro look (Now in a full-metal construction, this 2100-line watch features an octagonal form inherited from the DW-5000C, the very first G-SHOCK that debuted in 1983)
— Tough Solar (CASIO’s original solar-charging system converts not only sunlight but also light from fluorescent lamps and other sources into power)
— Mobile link (Wireless linking using Bluetooth(R)) (for time sync with your phone data)
— G-SHOCK Connected App (you may manage all watch settings through your phone)
— 200-meter water resistance (good for swimming but not for deep diving)
Other G-Shock GM Watches *similar by price and functions but different by cases
These are not all G-Shock GM Series. Here is a list of All G-Shock GM Watches →
Official Casio Description.
Introducing the first full-metal addition to the continually evolving 2100 line of timepieces that inherit the legacy of the first-ever G-SHOCK, the DW-5000C.
Luxe full-metal construction with a screw-back case, bezel, and band crafted in stainless steel creates a streamlined, minimalist design, while protecting the module from impact when dropped. We take it way back with the octagonal bezel and dimpled band design of the original from 1983, all done in metal.
High-density mounting keeps the analog-digital combination module slim, while still providing the advanced functions you love in a compact profile and comfortable fit.
Pairs with a smartphone via Bluetooth®. Simply tap into the dedicated app for precision timekeeping that keeps you on track. With Tough Solar, a high-brightness LED light and a range of other convenient functions, this is a timepiece that delivers on style and practical utility.
Official GM-B2100 Specs / Features *for base version GM-B2100D-1A
- Case size (L× W× H): 49.8 × 44.4 × 12.8 mm
- Case / bezel material: Stainless steel
- Weight: 165 g
- Band
Stainless Steel Band
Solid Band
One-touch 3-fold Clasp - Tough Solar (Solar powered)
- 200-meter water resistance
- Mobile link (Wireless linking using Bluetooth®)
- CASIO WATCHES App
- App connectivity feature
Auto time adjustment
Easy watch setting
Approximately 300 world time cities
Time & place
Reminder
Phone finder - Mineral Glass
- Screw Lock Back
- Compatible band size: 150 to 205 mm
- Neobrite
- World time
38 time zones (38 cities + coordinated universal time), city code display, city name display, daylight saving on/off, auto summer time (DST) switching, Home city/World time city swapping - Stopwatch
1/100-second stopwatch
Measuring capacity:
00’00”00~59’59”99 (for the first 60 minutes)
1:00’00~23:59’59 (after 60 minutes)
Measuring unit:
1/100 second (for the first 60 minutes)
1 second (after 60 minutes)
Measuring modes: Elapsed time, lap/split time - Countdown timer
Measuring unit: 1 second
Countdown range: 60 minutes
Countdown start time setting range: 1 second to 60 minutes (1-second increments and 1-minute increments) - 5 daily alarms
- Hourly time signal
- Light
Double LED light
LED light for the face (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)
LED backlight for the digital display (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow) - Full auto-calendar (to year 2099)
- Battery level indicator
- Approx. battery operating time:
7 months on rechargeable battery (operation period with normal use without exposure to light after charge)
18 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge) - Accuracy: ±15 seconds per month (with no mobile link function)
- 12/24-hour format
- Date/month display swapping
- Day display (days of the week selectable in six languages)
- Regular timekeeping:
- Analog: 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (battery level, mode)
- Digital: Hour, minute, second, pm, month, date, day
G-SHOCK GM-B2100 PROs & CONs
*we composed all points based on our ten years experience in writing about CASIO watches. We know what matters when you are searching for your ideal G-SHOCK!
– Full-metal Oak (very popular bezel design)
– Luxe Look (like other premium brands of much higher price)
– Minimalistic Design
– Slim module (good for classic wear)
– Solar Powered (Tough Solar)
– Screw-back case (like in old-school traditional watches but that also good for durability)
– Bluetooth (easy to operate via smartphone )
– Bluetooth Accuracy Calibration (checks if the watch shows the ideal time)
– Double LED Light (one for the face and one for the digital display)
– Doubtful readability (the hands are not very distinct in some series)
– Heavy (165 g while DW-5600 is 51 g)
– Mineral Glass (could be Sapphire)
– Not for everyday use (*too objective but still)
– Only traditional functions (World time, Stopwatch, Timer, Alarms etc.)
– High price (because of steel)
– No Radio Calibration (you have only – Bluetooth Time Sync)
– Difficult digital display readability (if the model uses negative type)
– No Second Hand
GM-B2100 Comparison Table with similar G-Shock Watches
GA-B2100 | GM-B2100 | ||
Price (Amazon) | |||
Year of first Release | 2022 | 2022 | 2019 |
Accuracy | Bluetooth (via phone app) | Bluetooth (via phone app) | ±15 seconds per month |
SmartWatch Features | Yes | Yes | No |
Light | Double LED light (Super Illuminator) | Double LED light (Super Illuminator) | Neobrite (hands and hour markers) Double LED light |
Alarm | 5 daily alarms | 5 daily alarms | 5 daily alarms |
Timer | Measuring unit: 1 second | Measuring unit: 1 second | Measuring unit: 1 second |
Stopwatch | 1/100-second stopwatch | 1/100-second stopwatch | 1/100-second stopwatch |
Hourly Time Signal | Yes | Yes | Yes |
World Time | 38 time zones (38 cities + coordinated universal time), city code display, city name display, daylight saving on/off, auto summer time (DST) switching, Home city/World time city swapping | 38 time zones (38 cities + coordinated universal time), city code display, city name display, daylight saving on/off, auto summer time (DST) switching, Home city/World time city swapping | 31 time zones (48 cities + coordinated universal time), daylight saving on/off |
Screw Back | No | Yes | No |
Carbon Core Guard | Yes | No | Yes |
Case / bezel material | Carbon / Resin | Stainless steel | Carbon / Resin |
Glass | Mineral Glass | Mineral Glass | Mineral Glass |
Battery | Solar powered (CTL920) | Solar powered (CTL920) | 3 years on SR726W |
Size (mm) *we consider 48.9×42.8×13.4 to be a traditional watch size (as in DW-5600). So you are to compare how far or close the watch is to this size | 48.5×45.4×11.9 | 49.8×44.4×12.8 | 48.5×45.4×11.8 |
Full features (if you want to know more) |
Recent News about GM-B2100
- [G-SHOCK 2023] GM-B2100GD-9A — Gold Metal Octagonal
- [G-SHOCK 2023] GM-B2100GD-9A — Gold Version of Octagon
- [G-SHOCK 2023] GM-B2100 — Steel Evolution of the Octagon
- [G-SHOCK Review] GM-B2100D-1A – Steel Gloss and Extremely Dark Display
- [G-SHOCK Comparison] GA-B2100 VS GM-B2100 VS GA-2100
Not sure about GM-B2100? There are more G-Shocks!
