StoreDeal.ai store
Shop
  • Deals
  • Deal checker
  • Black Friday
  • Buying guides
  • Brands
  • Stores
Travel
  • Flight deals
  • Hotel deals
Company
  • Research
  • Press
  • Use in AI assistants
  • Contact
  • deal.ai apps
Black Friday 2026
  • Walmart
  • Best Buy
  • Target
  • TVs
  • Laptops
  • Headphones
  • Apple
  • Gaming
  • Vacuums
  • Kitchen
  • Toys
  • Smartwatches
  • Tablets
  • Furniture
  • Mattresses
© Deal.ai Inc.·2222 Ponce de Leon Blvd, Miami, FL 33134·support@deal.ai
TermsPrivacy
Deal.ai › Casio
Casio
G-Shock GBM2100-1A
Casio

G-Shock GBM2100-1A

5(7 ratings)

Best price now

$209.18at Montres Big Time WatchesChecked Nov 9

Prices are checked against each store and labelled with when.

Visit Montres Big Time Watches

Ask our agent about this product

It checks today's price at every store, compares the alternatives and answers in about a minute.

Enter to send, Shift+Enter for a new line

Price facts

  • Last seen at $209.18 at Montres Big Time Watches on Nov 9.

Our take on the G-Shock GBM2100-1A

The G-Shock GBM2100-1A is a metal-clad version of Casio's octagonal 2100 line, with a stainless steel bezel over a bio-based resin case and band. It pairs Bluetooth smartphone link through the CASIO WATCHES app with Tough Solar charging, so routine use needs no battery swaps. At 11.9 mm thick and 72 g it wears slimmer and lighter than most full-steel G-Shocks, and it keeps 200 m water resistance and shock resistance. It suits people who want a tough everyday watch that looks clean with a jacket, and it undercuts steel-cased Bluetooth G-Shocks on features per dollar while giving up sapphire crystal and a metal bracelet.

Best forEveryday wear that moves from office to outdoorsBuyers who want solar charging and no battery changesFans of the octagonal 2100 case in a metal finishTravelers who use world time and auto DST
Pros
  • Tough Solar charging removes routine battery swaps
  • Bluetooth link gives automatic time adjustment and easy settings via the app
  • 200 m water resistance and shock-resistant construction
  • Slim 11.9 mm profile and 72 g weight for a metal-clad watch
  • 38 time zones with auto DST and home/world city swapping
  • Bio-based resin band and case reduce fossil-plastic use
Cons
  • Mineral glass rather than sapphire, so it can scratch
  • Resin band rather than a metal bracelet on a metal-look watch
  • Negative or basic LCD is small and hard to read at a glance
  • Bluetooth features depend on the app and phone pairing

G-Shock GBM2100-1A prices at every store

  • Montres Big Time WatchesNew

    In stockShips from Canada · priced in CAD (CA$295.00) · duties may applyReturn policy

    $209.18Checked Nov 9
    Visit Montres Big Time Watches

What reviewers say

Owners of the 2100 series praise the octagonal metal look, light weight and solar-plus-Bluetooth combo. Common complaints center on the mineral crystal scratching and the resin strap feeling less premium than the bezel suggests.

What people mention
  • BuildPraisedOwners like the stainless bezel and shock-resistant case, saying it feels solid without being heavy.
  • GlassCriticisedReviewers report the mineral crystal scratches more easily than sapphire.
  • BandMixedThe bio-based resin band is comfortable, but some find it less premium than the metal case.
  • SolarPraisedTough Solar keeps the watch running without battery changes in normal light.
  • App linkMixedBluetooth time sync and settings are handy, though pairing takes some patience.
  • DisplayCriticisedThe small LCD is hard to read quickly, especially in low light.

About the G-Shock GBM2100-1A

The Casio G-Shock GBM2100-1A is a metal-clad version of the 2100 series with an octagonal bezel. The case and bezel combine bio-based resin and stainless steel, and the band is made of bio-based resin. The glass is mineral glass, and the watch is shock resistant and water resistant to 200 meters.

It is powered by Tough Solar charging and connects to a smartphone over Bluetooth® through the CASIO WATCHES app, which adjusts the time automatically. A double LED light illuminates the face and the digital display. A hand shift feature moves the hands out of the way so the digital display is unobstructed.

Functions include world time for 38 time zones, a 1/100-second stopwatch, a countdown timer, 5 daily alarms and a full auto-calendar to the year 2099.

Case size
49.3 × 44.4 × 11.9 mm (L × W × H)
Weight
72 g
Case and bezel
Bio-based resin / stainless steel
Band
Bio-based resin
Band size
Fits wrists with a band size of 145 to 215 mm
Glass
Mineral glass
Construction
Shock resistant
Water resistance
200 meters
Power
Tough Solar (solar powered), rechargeable battery
Battery life
Approx. 7 months with normal use without exposure to light after charge; approx. 18 months stored in total darkness with Power Saving on after full charge
Connectivity
Bluetooth® wireless link to a smartphone
App
CASIO WATCHES, with auto time adjustment

Questions and answers

Does the GBM2100-1A need a battery change?
No. Tough Solar charges from light through the dial, so routine use does not require battery swaps. Keep it in light regularly and the charge holds.
What does the Bluetooth link add?
It connects to the CASIO WATCHES app for automatic time adjustment, easy alarm and world time setup, and phone finder. It is a convenience layer, not a smartwatch screen.
How does it compare with the standard GA-2100?
The GBM2100 adds a stainless steel bezel, Tough Solar and Bluetooth over the resin-cased GA-2100. It keeps the same octagonal shape and 200 m water resistance but costs more.
Is it good for swimming?
Yes. It is rated to 200 m water resistance, which covers swimming and snorkeling. Avoid pressing buttons underwater.
What is in the box?
The watch, a bio-based resin band, and documentation. The band fits wrists from 145 to 215 mm.
Can I read it in the dark?
It has Neobrite lume on the hands and an LED backlight for the digital display. The LCD is small, so reading it takes a moment.
Where is the G-Shock GBM2100-1A cheapest?
At Montres Big Time Watches, for $209.18, as of our latest check.
What do buyers say about the G-Shock GBM2100-1A?
Rated 5 out of 5 from 7 ratings.

More from Casio

  • C
    Casio G-Shock Analog-Digital Black GA-B001-1AJF
    Casio G-Shock Analog-Digital Black GA-B001-1AJF
  • C
    Casio Baby-G Black BGA-310C-1AJF
    Casio Baby-G Black BGA-310C-1AJF
  • C
    Casio G-Shock GM-2100-1AER
    Casio G-Shock GM-2100-1AER
  • C
    Casio MTP-B210D-2A1V Stainless Steel Watch
    Casio MTP-B210D-2A1V Stainless Steel Watch
  • C
    Casio G-Shock GA-B2100-1AJF 腕時計 メンズ
    Casio G-Shock GA-B2100-1AJF 腕時計 メンズ
  • C
    Casio GMS2110BP-5A
    Casio GMS2110BP-5A
  • C
    Casio Analog MRW210HB-5BV
World time
38 time zones (38 cities + coordinated universal time), auto daylight saving time switching, home city/world time city swapping
Stopwatch
1/100-second stopwatch; measures 00'00''00 to 59'59''99 for the first 60 minutes, then 1:00'00 to 23:59'59; elapsed time and lap/split time modes
Timer
Countdown timer, 60-minute range, start time set from 1 second to 60 minutes in 1-second and 1-minute increments
Alarm
5 daily alarms
Light
Double LED light (white): face light and digital display backlight, Super Illuminator, 1.5-second or 3-second duration, afterglow
Display
Neobrite luminous; hand shift feature
Calendar
Full auto-calendar to year 2099
Power saving
Display goes blank when the watch is left in the dark
Other features
Button operation tone on/off; battery level indicator
Accuracy
±15 seconds per month (without mobile link function)
Casio Analog MRW210HB-5BV
  • C
    Casio Baby-G BGA-250-1A2
    Casio Baby-G BGA-250-1A2
  • All Casio deals and products →

    More men's analog-digital watches

    • C
      Casio G-Shock GA-B2100-1ADR
      Casio G-Shock GA-B2100-1ADR
    • C
      Casio Analog-Digital 2100 Series GA-2100-1AJF
      Casio Analog-Digital 2100 Series GA-2100-1AJF
    • C
      Casio G-Shock Analog-Digital GA-2100-1AERP
      Casio G-Shock Analog-Digital GA-2100-1AERP
    • V
      Vintage AQ230EGL-9A
      Vintage AQ230EGL-9A
    • C
      Casio ABL100WE-7A
      Casio ABL100WE-7A
    • C
      Casio G-Shock Men's Watch GA-700-1B Analog-Digital
      Casio G-Shock Men's Watch GA-700-1B Analog-Digital
    • C
      Casio GA-2100GB-1AER Mens Watch G-Shock Classic 45mm 20ATM
      Casio GA-2100GB-1AER Mens Watch G-Shock Classic 45mm 20ATM
    • C
      Casio G-Shock Analog Digital White Resin White Dial Strap Quartz GA-2300-7A 200M Men's Watch
      Casio G-Shock Analog Digital White Resin White Dial Strap Quartz GA-2300-7A 200M Men's Watch