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Deal.ai › Casio › Mens Sport Watches
Casio
Casio G-Shock GD100-1B Men's Tough Digital Watch

Casio G-Shock GD100-1B Men's Tough Digital Watch

4(1 rating)

Best price now

$70.98at AmazonChecked 59 min ago

35% under what the other stores charge

Compared across 9 stores. Prices are checked against each store and labelled with when. As an Amazon Associate, Deal.ai earns from qualifying purchases.

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Price facts

  • Lowest price today: $70.98 at Amazon (checked Nov 11, 2026).
  • Checked at 9 stores.

Our take on the Casio G-Shock GD100-1B Men's Tough Digital Watch

The Casio G-Shock GD100-1B is a chunky, all-black digital sports watch built around G-Shock's shock-resistant resin case and 200-meter water resistance. It stands out for a large, easy-to-read digital display with Super Illuminator auto LED backlight, a 7-year battery, and a full feature set: world time across 31 time zones, a 1/100-second stopwatch, a 24-hour countdown timer, and five independent alarms. At roughly 55 mm across and 72 g, it is bigger and heavier than slim fitness watches, so it suits people who want a rugged, low-maintenance beater for the gym, field work, or water sports. Against pricier G-Shock models it trades Bluetooth and solar charging for simplicity, long battery life, and proven toughness.

Best forRugged everyday wear and outdoor workSwimming, surfing, and water sportsGym and training useTravelers who want multi-city world time
Pros
  • Shock-resistant resin case and bezel
  • 200-meter water resistance
  • 7-year battery life on a CR2025 cell
  • Large digital display with Super Illuminator auto LED backlight
  • World time across 31 time zones and 48 cities
  • Five independent alarms plus 1/100-second stopwatch and 24-hour timer
Cons
  • Large 55 mm case and 17 mm thickness feel bulky on smaller wrists
  • Basic ±15 seconds per month accuracy
  • No solar charging or Bluetooth smartphone link
  • Mineral crystal rather than sapphire

Casio G-Shock GD100-1B Men's Tough Digital Watch prices at every store

  • eBayNew

    In stockSold by jomashop

    $76.32Free shippingChecked 16 h ago
    Visit eBay
  • WalmartNew

    In stockSold by My Gift Stop

    $84.89Free shippingChecked 16 h ago
    Visit Walmart
  • CCSNew

    In stock

    $109.95Free shippingChecked 16 h ago
    Visit CCS
  • Casio AmericaNew

    In stock

    $110.00Free shippingChecked 16 h ago
    Visit Casio America
  • Macy'sNew

    In stock

    $110.00Free shippingChecked 16 h ago
    Visit Macy's
  • Best BuyNew

    In stock

    $110.00Free shippingChecked 16 h ago
    Visit Best Buy
  • KICKS CREWNew

    In stock

    $97.11+ $35.00 shippingChecked 59 min ago
    Visit KICKS CREW
  • AmazonNew

    Availability unknown

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

    $70.98Free shippingChecked 59 min ago
    Visit Amazon
  • GallsNew

    Out of stock

    $110.00+ $9.99 shippingChecked 16 h ago
    Visit Galls

Also available at

  • WalmartCheck price at Walmart

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

Casio G-Shock GD100-1B Men's Tough Digital Watch price history

$70.98$70.98
Nov 4Nov 11

Lowest price we've seen: $70.98 on Nov 4 at Amazon. Tracked across 9 stores since Nov 4.

What reviewers say

Owners of the GD100 series generally praise its toughness, legibility, and long battery life, treating it as a dependable beater watch. Common complaints focus on its size and weight and on the basic, no-frills feature set compared with higher-end G-Shocks.

What people mention
  • BuildPraisedOwners say the resin case and bezel shrug off drops and scrapes.
  • DisplayPraisedThe large digits and Super Illuminator backlight are called easy to read day or night.
  • BatteryPraisedThe multi-year battery life is a common reason owners pick it over rechargeable watches.
  • SizeCriticisedReviewers note the case is large and thick and can overwhelm smaller wrists.
  • WeightMixedSome find the watch heavy for all-day wear, while others say it feels solid.
  • FeaturesMixedBuyers like the alarms and world time but miss solar charging and Bluetooth.

From Galls

  • Shock resistant
  • 200M water resistant
  • Auto LED Backlight (Super Illuminator)
  • Large digital display area
  • Multi-time (4 different cities)
  • 7-year battery life
Materials
Black resin band
Fit
X-large G series
Shipping
Due to high demand, this item is backordered and will ship when available.

About the Casio G-Shock GD100-1B Men's Tough Digital Watch

The Casio G-Shock GD100-1B is a men's digital sport watch with a black resin case, a fixed black resin bezel and a black resin strap. The round case has a solid case back and a tang clasp. The movement is quartz, and the crystal is scratch-resistant mineral glass.

The black digital dial shows hours, minutes, seconds, date and day of the week, in a 12/24-hour format. An Auto LED backlight (Super Illuminator) lights the large display area. The watch is shock resistant and water resistant to 200 meters (660 feet).

Functions include world time for 31 time zones (48 cities plus coordinated universal time) and a 1/100-second stopwatch. The countdown timer ranges from 1 second to 24 hours. There are 5 independent alarms, set as daily or one-time. Accuracy is ±15 seconds per month, and the battery lasts 7 years.

Case material
Resin
Strap
Black resin with tang clasp
Case size
55×51.2×17.4 mm
Weight
72 g
Water resistance
200 m / 660 ft
Crystal
Scratch-resistant mineral
Movement
Quartz, ±15 seconds per month
Battery
CR2025, 7-year life
Fit
X-large G series
Display
Digital, with Auto LED backlight

Specifications

Battery life
7 yearsSource
Battery type
CR2025Source
Water resistance
200M Water ResistantSource
Shock resistance
Shock ResistantSource
Case size

Questions and answers

Is the GD100-1B good for swimming?
Yes. It is rated to 200 meters of water resistance, which covers swimming, snorkeling, and most water sports. Avoid pressing the buttons underwater.
How long does the battery last?
Casio rates the CR2025 battery at about 7 years. The backlight and alarms draw power, so heavy use can shorten that.
How big is it on the wrist?
The case is about 55 mm wide and 17 mm thick at 72 g. It wears large and is best suited to medium and larger wrists.
Does it have a light for night use?
Yes. It has a Super Illuminator LED backlight with an auto-light mode that turns on when you tilt your wrist.
What is in the box?
The watch with its resin strap and a user manual. The battery is already installed.
How does it compare with other G-Shock models?
It offers the same core toughness and water resistance as classic G-Shocks, with a bigger display and longer battery life, but no solar power or Bluetooth.
Where is the Casio G-Shock GD100-1B Men's Tough Digital Watch cheapest?
At Amazon, for $70.98, 35% under what the other stores charge, as of our latest check.
Is the Casio G-Shock GD100-1B Men's Tough Digital Watch at its lowest price?
Yes: $70.98 is the lowest price we've seen for it since November 4.
What do buyers say about the Casio G-Shock GD100-1B Men's Tough Digital Watch?
Rated 4 out of 5 from 1 ratings.
Where can I buy the Casio G-Shock GD100-1B Men's Tough Digital Watch?
9 stores we checked sell it, including Amazon, KICKS CREW, eBay, Walmart, CCS.

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Stores we've priced the Casio G-Shock GD100-1B Men's Tough Digital Watch at

  • Best Buy deals and prices
  • CCS deals and prices
  • Macy's deals and prices
  • Walmart deals and prices

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55×51.2×17.4mm
Source
Total weight
72gSource
World time zones
31 time zones (48 cities + coordinated universal time)Source
Stopwatch resolution
1/100-secondSource
Countdown range
1 second to 24 hoursSource
Alarms
5 alarms (daily or one-time)Source
Accuracy
±15 seconds per monthSource
Case material
ResinSource
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