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Casio
Casio G-Shock GA100-1A1 Men's Tough Analog-Digital Watch

Casio G-Shock GA100-1A1 Men's Tough Analog-Digital Watch

Best price now

$60.00at eBayChecked 1 h ago

49% under what the other stores charge

Compared across 20 stores. Prices are checked against each store and labelled with when. Store links may earn us a commission.

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Price facts

  • Lowest price today: $60.00 at eBay (checked Nov 11, 2026).
  • It's down $23.60 from $83.60 a week ago.
  • Checked at 20 stores.

Our take on the Casio G-Shock GA100-1A1 Men's Tough Analog-Digital Watch

The Casio G-Shock GA-100 is a large, rugged analog-digital watch built for hard use. It combines hands with an LCD screen, adds a 1/1000-second stopwatch, countdown timer, 24-hour alarm and full auto-calendar, and is water resistant to 200 meters. At 55 mm wide and 16.9 mm thick it wears big, so it suits people who like an oversized tool watch rather than a slim dress piece. Against slimmer G-Shock models it offers more display and timing functions; against pricier G-Shock lines it gives up solar power and radio timekeeping.

Best forOutdoor and sports usePeople who want an oversized tool watchSwimmers and water-sports usersBuyers wanting analog and digital displays together
Pros
  • 200 m water resistance
  • Shock-resistant resin case and bezel
  • Analog hands plus LCD display
  • 1/1000-second stopwatch with speed indicator
  • Full auto-calendar to 2099
  • Light weight at about 70 g
Cons
  • Large 55 mm case and 16.9 mm thickness
  • Mineral glass rather than sapphire
  • Two-year battery, not solar
  • Busy dial can be hard to read at a glance
  • No radio-controlled timekeeping

Casio G-Shock GA100-1A1 Men's Tough Analog-Digital Watch prices at every store

  • JomashopNew

    In stock

    $79.00+ $5.99 shippingChecked 1 h ago
    Visit Jomashop
  • CreationWatchesNew

    In stock

    $90.00+ $8.00 shippingChecked 1 h ago
    Visit CreationWatches
  • TQ DiamondsNew

    In stock

    $110.00Free shippingChecked 1 h ago
    Visit TQ Diamonds
  • House Of ScubaNew

    In stock

    $110.00Checked 1 h ago
    Visit House Of Scuba
  • NeweggNew

    In stock

    $112.46Free shippingChecked 1 h ago
    Visit Newegg
  • Dressinn.comNew

    In stockShips from abroad · duties may apply

    $100.99+ $15.99 shippingChecked 1 h ago
    Visit Dressinn.com
  • Chrono24.comNew

    In stockMade for another market

    $89.00+ $29.00 shippingChecked 1 h ago
    Visit Chrono24.com
  • watchclick.comNew

    In stock

    $118.80Checked 1 h ago
    Visit watchclick.com
  • BrandsWalkNew

    In stock

    $120.00Free shippingChecked 1 h ago
    Visit BrandsWalk
  • TillysNew

    In stock

    $120.00Free shippingChecked 1 h ago
    Visit Tillys
  • CASIONew

    In stock

    $120.00Free shippingChecked 1 h ago
    Visit CASIO
  • Argenteria MBNew

    In stockShips from Italy · duties may apply

    $132.01Checked 1 h ago
    Visit Argenteria MB
  • KICKS CREWNew

    In stock

    $105.30+ $35.00 shippingChecked 1 h ago
    Visit KICKS CREW
  • Helveti EUNew

    In stockShips from the EU · duties may apply

    $132.01+ $8.88 shippingChecked 1 h ago
    Visit Helveti EU
  • hollandwatchgroup.comNew

    In stockMade for another market

    $132.01+ $13.37 shippingChecked 1 h ago
    Visit hollandwatchgroup.com
  • Timeshop24.comNew

    In stock

    $119.46+ $28.60 shippingChecked 1 h ago
    Visit Timeshop24.com
  • The Watch GalleryNew

    In stockShips from France · duties may apply

    $125.00+ $24.60 shippingChecked 1 h ago
    Visit The Watch Gallery
  • MITNew

    In stock

    $139.86+ $14.20 shippingChecked 1 h ago
    Visit MIT
  • eBayPre-owned

    Availability unknownReturns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.

    $39.99+ $6.08 shippingChecked 1 h ago
    Visit eBay
  • eBayNew

    Availability unknownReturns: Set by the eBay seller; the eBay Money Back Guarantee covers an item that doesn't arrive or isn't as described.

    $60.00+ $6.09 shippingChecked 1 h ago
    Visit eBay
  • AmazonNew

    Availability unknown

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

    $83.60Free shippingChecked 1 h ago
    Visit Amazon

Also available at

  • eBayCheck price at eBay

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

Casio G-Shock GA100-1A1 Men's Tough Analog-Digital Watch price history

$83.60$79.00
Nov 4Nov 11

Lowest price we've seen: $79.00 on Nov 11 at Jomashop; highest $83.60 on Nov 4. Tracked across 19 stores since Nov 4.

From Chrono24.com

  • Casio G-Shock GA-100-1A1ER, new condition
  • Rubber bracelet
  • Case diameter 55 x 51.2 mm
  • Comes with original box and original papers
  • Listed by a Trusted Seller on Chrono24
Materials
Rubber bracelet
Guarantee
Buyer Protection: every new and used watch on Chrono24 is authentic; 14 days after delivery to contact support and get your money back if issues arise.
Returns
14-day money-back guarantee: if the watch arrives defective or not as the seller described, you have 14 days to initiate a return and receive a refund of the pu
Shipping
Free, secure shipping within the United States of America; item in stock, fully insured, anticipated delivery in 2 - 7 days.
In the box
Original box, Original papers

About the Casio G-Shock GA100-1A1 Men's Tough Analog-Digital Watch

The Casio G-Shock GA-100-1A1 is a men's analog-digital watch with a round black resin case and bezel and a resin band. The dial is a black LCD. The glass is mineral with an anti-scratch coating, and the case back is held in place by screws.

It has a Japanese Casio quartz movement (module 5081) with accuracy of +/- 15 seconds per month. The full auto-calendar is pre-programmed until the year 2099. The stopwatch measures to 1/1000th of a second and has a speed indicator. The watch is water resistant to 200 meters.

Case size
55 x 51.2 x 16.9 mm
Case material
Resin
Band
Resin
Glass
Mineral glass with anti-scratch coating
Water resistance
200 m
Movement
Quartz, module 5081
Battery
CR1220, about 2 years
Color
Black
Buttons
1 winding button, 4 push buttons

What buyers say

Buyers like
  • Smooth and efficient purchase
  • Item arrived in especially secure packaging
  • Watch was new and unworn as described
  • Fast delivery
  • Product as advertised
  • Good communication
Buyers complain about
  • Seller needs more than 1 day to reply
  • Some low-star reviews (7 one-star ratings)

Specifications

Case dimensions
55 x 51.2 x 16.9mmSource
Water resistance
200M Water ResistantSource
Battery type
CR1220Source
Battery life
2 yearsSource
Module

Questions and answers

Is the GA-100 good for swimming?
Yes. It is rated 200 m water resistant, which covers swimming and most water sports. Casio does not rate it for saturation diving.
How big does it wear?
The case is 55 mm long, 51.2 mm wide and 16.9 mm thick, so it sits large on most wrists. It weighs about 70 g, so the size is more noticeable than the weight.
Does it have a light?
Yes. An LED light illuminates the display for reading in the dark.
How accurate is it?
Casio rates it at plus or minus 15 seconds per month. It is quartz, so it does not sync to a time signal automatically.
What is in the box?
The watch, its original box and papers, and a two-year international warranty.
Does it need charging?
No. It runs on a CR1220 battery that Casio rates for about two years.
Where is the Casio G-Shock GA100-1A1 Men's Tough Analog-Digital Watch cheapest?
At eBay, for $60.00, 49% under what the other stores charge, as of our latest check.
Is the Casio G-Shock GA100-1A1 Men's Tough Analog-Digital Watch at its lowest price?
Yes: $60.00 is the lowest price we've seen for it since November 4.
What do buyers say about the Casio G-Shock GA100-1A1 Men's Tough Analog-Digital Watch?
Buyers like: Smooth and efficient purchase; Item arrived in especially secure packaging; Watch was new and unworn as described. Common complaints: Seller needs more than 1 day to reply; Some low-star reviews (7 one-star ratings).
Where can I buy the Casio G-Shock GA100-1A1 Men's Tough Analog-Digital Watch?
20 stores we checked sell it, including Amazon, eBay, Chrono24.com, Dressinn.com, TQ Diamonds.

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Stores we've priced the Casio G-Shock GA100-1A1 Men's Tough Analog-Digital Watch at

  • Chrono24.com deals and prices
  • MIT deals and prices
  • Newegg deals and prices
  • Timeshop24.com deals and prices
  • Trekkinn.com deals and prices
5081
Source
Accuracy
+/- 15 seconds per monthSource
Calendar
Full Auto-Calendar (pre-programmed until the year 2099)Source
Stopwatch
1/1000th Second Stopwatch with Speed IndicatorSource
Band material
Resin BandSource
Case and bezel material
ResinSource
Glass
Mineral GlassSource
Total weight
70gSource

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