Casio G-Shock GA100-1A1 | Men's Tough Analog-Digital Watch | 200M Water Resistant | Shock & Magnetic Resistant | Sporty & Rugged Design

4.7 out of 5 stars 7,363 ratings
$69.00 with 37 percent savings
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About this item

  • Band Size: Mens-Standard
  • Shock Resistant
  • Auto LED Light with Afterglow
  • Magnetic Resistant

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Casio G-Shock GA100-1A1 | Men's Tough Analog-Digital Watch | 200M Water Resistant | Shock & Magnetic Resistant | Sporty & Rug
This item: Casio G-Shock GA100-1A1 | Men's Tough Analog-Digital Watch | 200M Water Resistant | Shock & Magnetic Resistant | Sporty & Rugged Design
$69.00
Get it as soon as Monday, Jun 30
Ships from and sold by Amazon.com.
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Casio Men's G-Shock Analog-Digital Watch GA-100C-8ACR, Grey/Neon Blue
$73.84
Get it as soon as Sunday, Jun 29
Only 3 left in stock - order soon.
Sold by Watchsavings and ships from Amazon Fulfillment.
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Casio G-Shock GD100-1B | Men's Tough Digital Watch | 200M Water Resistant | High-Brightness LED | Dual Time & 7-Year Battery
$59.99
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Product specifications

Watch Information
Brand, Seller, or Collection Name Casio
Model number GA-100-1A1DR (G270)
Part Number GA100-1A1
Model Year 2018
Item Shape Round
Dial window material type Mineral Glass
Display Type Analog-Digital
Clasp Buckle
Case material Resin
Case diameter 5.1 centimeters
Case Thickness 16.9 millimeters
Band Material Resin
Band size Mens Standard
Band width 21 millimeters
Band Color Black
Dial color Black
Bezel material Resin
Bezel function Stationary
Calendar Day-Month
Special features Timer, Stopwatch, Alarm
Item weight 2.5 ounces
Movement Japanese Quartz
Water resistant depth 200 Meters
Warranty Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 1 x 1 x 1 inches; 2.5 ounces
  • Item model number ‏ : ‎ GA-100-1A1DR (G270)
  • Department ‏ : ‎ mens
  • Batteries ‏ : ‎ 1 Lithium Metal batteries required. (included)
  • Date First Available ‏ : ‎ March 16, 2010
  • Manufacturer ‏ : ‎ Casio
  • ASIN ‏ : ‎ B003WPUU0U
  • Country of Origin ‏ : ‎ China
  • Customer Reviews:
    4.7 out of 5 stars 7,363 ratings

Product Description

G-SHOCK GA100-1A1: The Ultimate Tough & Tactical Watch Designed for those who demand extreme durability and precision, the G-SHOCK GA100-1A1 is a rugged yet stylish timepiece that combines analog and digital displays for maximum functionality. Built with shock resistance, magnetic resistance, and 200-meter water resistance, this watch is engineered for military, athletes, outdoor adventurers, and extreme sports enthusiasts. The matte black resin case and band provide a stealthy, tactical look, while the oversized face and high-contrast digital-analog layout ensure easy readability. Whether you're timing a workout, tracking speed, or setting alarms, the GA100-1A1 delivers reliable performance in any environment. Equipped with a 1/1000-second stopwatch, speed indicator, and countdown timer, this G-SHOCK is perfect for training and competition. The LED backlight with afterglow ensures visibility in the dark, while five daily alarms and world time settings keep you on track across time zones. With its bold design, legendary toughness, and versatile functionality, the GA100-1A1 is not just a watch—it’s a statement of strength and endurance.

Top Brand: Casio

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Important information

Legal Disclaimer

This watch is used, but like brand new. also it is navy blue

Customer reviews

4.7 out of 5 stars
7,363 global ratings

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Customers say

Customers find this watch to be a fantastic timepiece that goes well with every outfit and can take a real beating. They appreciate its value for money at the $100 price point, and one customer mentions it's perfect for weekend camping use. While the analog hands are easy to read in any light conditions, the digital displays are difficult to see, and the illumination feature is generally useless.

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Watch qualityLooksDurabilityValue for moneySizeFunctionalityReadabilityLight quality
1,052 customers mention "Watch quality"1,052 positive0 negative

Customers find this watch fantastic, with one mentioning it's a great weekend/camping watch.

"WOW..... This is a GREAT watch for sure. It was just delivered early today. I believe should got this watch before. That's me being STUPID sometimes...." Read more

"...No concerns with this seller, the watch is authentic and 75 dollars is a steal. The watch looks brand new, not a single scratch, and I abuse watches...." Read more

"For sure this is a great watch along the time. Quality, resistance, water resistance, style and great price" Read more

"This is a great watch and I almost cancelled my order because the legal disclaimer on this item says that it is Navy Blue and is used which had me..." Read more

742 customers mention "Looks"711 positive31 negative

Customers appreciate the watch's appearance, noting that it goes well with every outfit and is impressive enough for formal wear.

"...Was originally looking for a stylish, utility watch that HAD to be waterproof, I'm glad I chose it...." Read more

"...Quality, resistance, water resistance, style and great price" Read more

"...and hope that it serves me for a long time because it is a great looking watch...." Read more

"...that this watch offers along with a wonderful warranty and a slick design its very hard to argue that you overpaid for this watch...." Read more

552 customers mention "Durability"530 positive22 negative

Customers praise the watch's durability, noting its great build quality and ability to take a real beating.

"For sure this is a great watch along the time. Quality, resistance, water resistance, style and great price" Read more

"...great confidence that this watch will more than likely be used very much for work, play and the military and hope that it serves me for a long time..." Read more

"...So if you are looking for a inexpensive, durable, and slick watch this one is a great choice for you...." Read more

"...I love the bright hands, easy time setting, plus, Casio's durable "G-Shock "™ quality and reliable accuracy...." Read more

341 customers mention "Value for money"289 positive52 negative

Customers find the watch reasonably priced and worth the buy.

"...That's me being STUPID sometimes. Great price, fit, button functionality, water resistance and functionality is SWEET. Thanks you....." Read more

"...TLDR: no nonsense stylish rugged watch with many features at a great price." Read more

"...Quality, resistance, water resistance, style and great price" Read more

"...Pros: 1 - Relatively inexpensive. 2 - Slick comfortable design. 3 - Easy to read watch face. 4 - Easy to use functions...." Read more

275 customers mention "Size"213 positive62 negative

Customers appreciate the watch's size, noting that it is just right and doesn't overpower the wrist, with one customer mentioning it fits well under dress shirt sleeves.

"...That's me being STUPID sometimes. Great price, fit, button functionality, water resistance and functionality is SWEET. Thanks you....." Read more

"...The watch may appear big on some wrists, but it's no bigger than a standard rugged watch. Hopefully will be able to use this watch for years to come...." Read more

"...those concerned about the size of the watch, it does have a good size in circumference and height off the wrist, but nothing out of the ordinary..." Read more

"...I really like the size, the weight and the look...." Read more

251 customers mention "Functionality"198 positive53 negative

Customers are satisfied with the watch's functionality, noting that it keeps working even after three months of use, with the light feature performing well.

"...Great price, fit, button functionality, water resistance and functionality is SWEET. Thanks you....." Read more

"...Matches many outfits, works with black very well...." Read more

"...a variety of functions from timer to alarms (4 alarms total) to stopwatch functions. Everything you would expect from a digital watch...." Read more

"...The watch simply never worked again after this incident - the battery was replaced, and the watch could never have its time reset successfully...." Read more

312 customers mention "Readability"97 positive215 negative

Customers have mixed opinions about the watch's readability: while some find it very easy to read in any light conditions and appreciate the analog hands, others report that the digital displays are difficult to see, particularly at night.

"...The digital readout is only visible in direct light, and even then, once an hour it is not due to the hands covering them up...." Read more

"...2 - Slick comfortable design. 3 - Easy to read watch face. 4 - Easy to use functions...." Read more

"...Sure the digital parts are kind of hard to read in certain light conditions but overall a great watch. Holds up well to extreme conditions...." Read more

"...The users guide is a small novel, and has alot of small text, and trying to figure out everything is a little tricky Overall:..." Read more

409 customers mention "Light quality"86 positive323 negative

Customers criticize the watch's light quality, noting that the illumination is useless and the numbers are very dim, making it virtually invisible.

"...1 - Daunting manual. 2 - A bit mushy buttons 3 - Weird luminescence feature. Now in nor depth: PROS:..." Read more

"...- The biggest problem I have is the light up feature. When really dark out, it doesn't fully light up the face of the watch...." Read more

"...The LED light is lame. I can't put it any other way...." Read more

"...The major plusses? I love the bright hands, easy time setting, plus, Casio's durable "G-Shock "™ quality and reliable accuracy...." Read more

AWESOME.....
5 out of 5 stars
AWESOME.....
WOW..... This is a GREAT watch for sure. It was just delivered early today. I believe should got this watch before. That's me being STUPID sometimes. Great price, fit, button functionality, water resistance and functionality is SWEET. Thanks you.....
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Top reviews from the United States

  • Leebone
    5.0 out of 5 stars AWESOME.....
    Reviewed in the United States on June 17, 2025
    Verified Purchase
    WOW..... This is a GREAT watch for sure. It was just delivered early today. I believe should got this watch before. That's me being STUPID sometimes. Great price, fit, button functionality, water resistance and functionality is SWEET. Thanks you.....
    Customer image
    Leebone
    5.0 out of 5 stars
    AWESOME.....

    Reviewed in the United States on June 17, 2025
    WOW..... This is a GREAT watch for sure. It was just delivered early today. I believe should got this watch before. That's me being STUPID sometimes. Great price, fit, button functionality, water resistance and functionality is SWEET. Thanks you.....
    Images in this review
    Customer imageCustomer image
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  • Christian Sangster
    5.0 out of 5 stars Very good watch for the money
    Reviewed in the United States on April 8, 2025
    Verified Purchase
    Been daily driving this watch for about a month now, it is a very high quality watch. No concerns with this seller, the watch is authentic and 75 dollars is a steal. The watch looks brand new, not a single scratch, and I abuse watches. Was originally looking for a stylish, utility watch that HAD to be waterproof, I'm glad I chose it. It has two cities for each global time zone, includes a stopwatch, and a light button for night viewing. The side buttons are recessed, so it is difficult to press them accidentally. Matches many outfits, works with black very well. Have knocked it on many doorframes, metal shelves, even gone swimming with it and it still looks brand new. The timekeeping is extremely accurate, having lost less than a second in a month. The watch may appear big on some wrists, but it's no bigger than a standard rugged watch. Hopefully will be able to use this watch for years to come. TLDR: no nonsense stylish rugged watch with many features at a great price.
    3 people found this helpful
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  • Jose Luis
    5.0 out of 5 stars Best watch ever
    Reviewed in the United States on May 26, 2025
    Verified Purchase
    For sure this is a great watch along the time. Quality, resistance, water resistance, style and great price
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  • Nathan Y
    5.0 out of 5 stars Need to Correct Legal Disclaimer
    Reviewed in the United States on April 8, 2025
    Verified Purchase
    This is a great watch and I almost cancelled my order because the legal disclaimer on this item says that it is Navy Blue and is used which had me concerned but it arrived as advertised- new and in black. My daily wear is a G-Shock MOVE GPS GBD-H1000-1 but this GA-100-1A1 was my first G-Shock that I wore for 5 years previously and ordered another one because I loved it so much and for times when I can't have a smartwatch with GPS on it and something to fit into my rotation of watches.
    One person found this helpful
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  • Adolfo Morles Salas
    4.0 out of 5 stars BUENO
    Reviewed in the United States on June 16, 2025
    Verified Purchase
    Muy Buen Reloj
    Helpful
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  • Kraig Smith
    5.0 out of 5 stars great watch looks sleek and modern
    Reviewed in the United States on May 30, 2025
    Verified Purchase
    great watch
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  • Buyer102
    5.0 out of 5 stars Na
    Reviewed in the United States on May 2, 2025
    Verified Purchase
    It’s good
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  • Rogelio Fiorenzano
    5.0 out of 5 stars Excellent watch for military Physical Training
    Reviewed in the United States on September 9, 2014
    Verified Purchase
    There has been quite a few discussions on here regarding the quality of this watch and a line down the middle regarding the lighting of the watch's display and a very small portion of folks indicating that the time was never correct on the watch.

    To address the point almost half the reviews being made about the lighting, the watch display is lit by a single "amber" colored LED (to save power and provide a low light profile, I imagine) which provides more than adequate lighting for the analog hands on the watch to be viewed in pitch black darkness. The watch has a configuration option which allows you to modify the amount of time the LED light stays on from 1.5 to 3.0 seconds. The default time was sufficient for me to view the time but others may find the additional time convenient. This additional time may be what supplements the ability to view the digital time easier. Another owner of this watch indicated that placing an finger across the watch face from 9 to 3 (across the horizontal horizon) allows for the illumination to better reflect back onto the digital display for easier reading. I concur with this assessment and was able to read the time with both the 1.5 and 3.0 second configuration. This is not to say that the time on the digital display is what I would personally be using in low light conditions but it is definitely possible.

    Finally, the last point to discuss is the settings of the watch and the provided instruction manual in the packaging. Some have complained that the instructions are far too exhaustive due to the instruction manual being of significant length. To these people I say, "Did you even try cycling through the pages?" The instructions that came with my watch came with at least 4-6 different languages so that others that do not read english could take advantage of this product. The english instructions were probably about 40 pages to include the table of contents and some "Care Instructions". I was able to configure the analogue portion of the watch and the world time (to include modifying the Daylight Savings Time setting) in roughly 5-10 minutes at the most. Those that were unable to properly set this watch either did not focus on the various time zones that are clearly identified in the manual, or did not properly configure the Daylight Savings Time option for their time zone.

    I can say with great confidence that this watch will more than likely be used very much for work, play and the military and hope that it serves me for a long time because it is a great looking watch. Additionally, for those concerned about the size of the watch, it does have a good size in circumference and height off the wrist, but nothing out of the ordinary such as watches from Invicta dive watches. The weight of the watch is very light for me but I am accustomed to watches made of steel with a steel band and that may be causing me to think the watch is light in weight.

    Hopefully this conveys a very descriptive point of view regarding this watch and points out the supposed "flaws" others have portrayed in their reviews.
    37 people found this helpful
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Top reviews from other countries

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  • Milena Vila
    5.0 out of 5 stars Perfeito!
    Reviewed in Brazil on August 10, 2024
    Verified Purchase
    Chegou todo certinho. Relógio original.
    Report
  • Client d'Amazon
    5.0 out of 5 stars Parfaite
    Reviewed in France on August 14, 2017
    Verified Purchase
    Une superbe montre qui fait son travail belle efficace enfin absolument pas déçu
    Qualité au top est très belle boîte
    Qui va avec. Je la recommande !
    Report
  • Miguel Ángel
    5.0 out of 5 stars Resistente
    Reviewed in Mexico on September 25, 2020
    Verified Purchase
    Muy bien
    Report
  • Gavin James Sayer
    5.0 out of 5 stars G-Shock durability.
    Reviewed in Australia on April 3, 2022
    Verified Purchase
    The media could not be loaded.
    Hey guys wanted to let you know what to expect when receiving this item with an unboxing. Wasn't sure why it didn't come in a box tin like the last one I had purchased else where and it says cased in china instead of thailand. From some researching looks like casio have started to send there japanese made internal parts to china to get cased with their resin materials to keep costs down on their lower line watchers. I don't believe it's a knock off and works fine. Performing the 3 button test for you all aswell. Hope this helps your purchasing decisions. Also the clock arms are white not silver and it is rather dark face but I wouldnt say you can't read it like some people on here it. Makes it look stealthy and pretty cool like this aswell.
    Customer image
    Gavin James Sayer
    5.0 out of 5 stars
    G-Shock durability.

    Reviewed in Australia on April 3, 2022
    Hey guys wanted to let you know what to expect when receiving this item with an unboxing. Wasn't sure why it didn't come in a box tin like the last one I had purchased else where and it says cased in china instead of thailand. From some researching looks like casio have started to send there japanese made internal parts to china to get cased with their resin materials to keep costs down on their lower line watchers. I don't believe it's a knock off and works fine. Performing the 3 button test for you all aswell. Hope this helps your purchasing decisions. Also the clock arms are white not silver and it is rather dark face but I wouldnt say you can't read it like some people on here it. Makes it look stealthy and pretty cool like this aswell.
    Images in this review
    Customer imageCustomer imageCustomer image
    Report
  • Muhammad Ghanem
    5.0 out of 5 stars ممتازه
    Reviewed in Egypt on July 10, 2024
    Verified Purchase
    ساعه ممتازه
    Report