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Deal.ai › Casio › Wrist Watches
Casio
Casio G-Shock GA2100-1A3

Casio G-Shock GA2100-1A3

4.6(48 ratings)

Best price now

$78.52at WalmartChecked 6 min ago

24% under what the other stores charge

Compared across 4 stores. Prices are checked against each store and labelled with when.

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Price facts

  • Lowest price today: $78.52 at Walmart (checked Nov 11, 2026).
  • Checked at 4 stores.

Our take on the Casio G-Shock GA2100-1A3

The GA2100-1A3 is Casio's "CasiOak": a slim, octagonal analog-digital G-Shock in black resin with a black dial and green accents. It stands out for its thin case and light weight, which make it wear far closer to a casual watch than a typical chunky G-Shock. It suits people who want G-Shock toughness and 200m water resistance in a watch that fits under a cuff. Against pricier steel CasiOaks and the larger GA-100 line, it gives up metal and some dial legibility but keeps the full feature set.

Best forEveryday casual wearFans of the octagonal CasiOak lookSwimmers and outdoor usePeople who dislike bulky watches
Pros
  • Slim, light resin case wears comfortably
  • 200m water resistance
  • Analog and digital displays together
  • World time, stopwatch, alarm and perpetual calendar
  • Mineral glass and shock-resistant build
Cons
  • Dark hands and markers are hard to read in low light
  • Resin bezel and strap scratch and scuff over time
  • No solar charging or Bluetooth like some G-Shocks
  • Basic backlight rather than full illumination

Casio G-Shock GA2100-1A3 prices at every store

  • WalmartNew

    In stockSold by My Gift Stop

    $78.52Free shippingChecked 6 min ago
    Visit Walmart
  • StockXNew

    In stock

    $143.00+ $14.95 shippingChecked 6 min ago
    Visit StockX
  • AmazonNew

    Availability unknown

    As an Amazon Associate, Deal.ai earns from qualifying purchases.

    $103.99Free shippingChecked 6 min ago
    Visit Amazon
  • CASIONew

    Out of stock

    $99.00Free shippingChecked 6 min ago
    Visit CASIO

Store links may earn us a commission. Some prices via Klarna.

Casio G-Shock GA2100-1A3 price history

$99.00$78.52
Nov 10Nov 11

Lowest price we've seen: $78.52 on Nov 11 at Walmart; highest $99.00 on Nov 10. Tracked across 4 stores since Nov 10.

What reviewers say

  • 4.6 / 548 ratings

Owners rate it highly for its looks, light weight and everyday toughness. The most common complaints are legibility of the dark dial and the resin picking up scratches.

What people mention
  • LegibilityCriticisedOwners say the black hands and markers on the dark dial are hard to read in low light.
  • Size and weightPraisedReviewers like how slim and light it feels compared with other G-Shocks.
  • BuildPraisedBuyers describe it as tough and well made for a resin watch.
  • DurabilityMixedThe resin bezel and strap are reported to scratch and scuff with daily wear.
  • DesignPraisedThe octagonal CasiOak styling is the main reason people buy it.

About the Casio G-Shock GA2100-1A3

A nice looking watch from Casio which has black for its dial color. Among other things, this watch can display today's date.

Specifications

Color (Strap)
BlackSource
Closure
BuckleSource
Glass
MineralSource
Watch Strap Material
ResinSource
Functions

Questions and answers

Is the GA2100-1A3 good for swimming?
Yes. It is rated to 20 ATM, or 200 meters, so swimming and snorkeling are fine. Casio does not rate it for scuba diving.
How does it compare with the steel GM2100 CasiOak?
The GM2100 has a metal bezel and case and feels more premium. The GA2100-1A3 is lighter and all resin, and uses the same module and features.
Does it need a battery?
Yes. It runs on a standard quartz battery, not solar. Casio rates battery life at about three years.
What is in the box?
The watch on its resin strap and a manual. No charging cable or extra tools are included.
Can the hands be read at night?
There is an LED backlight, but the hands themselves have no lume. Reading the analog hands in the dark is limited.
Is it too big for small wrists?
No. The case is about 45mm wide but only around 11mm thick, and it weighs about 1.8 oz, so it sits flat on most wrists.
Where is the Casio G-Shock GA2100-1A3 cheapest?
At Walmart, for $78.52, 24% under what the other stores charge, as of our latest check.
What do buyers say about the Casio G-Shock GA2100-1A3?
Rated 4.6 out of 5 from 48 ratings.
Where can I buy the Casio G-Shock GA2100-1A3?
4 stores we checked sell it, including CASIO, Amazon, Walmart, StockX.

Stores we've priced the Casio G-Shock GA2100-1A3 at

  • Walmart deals and prices

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All Casio deals and products →
Lighting, Alarm, Perpetual Calendar, Date, Worldtimer, StopwatchSource
Gender
MaleSource
Series
Casio G-ShockSource
Case Color
BlackSource
Weight (oz)
1.8Source
Movement Type
QuartzSource
Type of Index
Index (without numbers)Source
Display Type
Digital, AnalogSource
Dial Color
BlackSource
Time Format
12 Hours, 24 HoursSource
Case Material
ResinSource
Water Protection
20 ATM (200m)Source