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Casio

G-Shock X-Large GA100

  • Based on 1,289 reviews
Condition: New
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Availability: Only 5 left in stock, order soon!
Fulfilled by sasy420
Arrives Aug 28 – Sep 3
Order within 1 hour and 8 minutes
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Features

  • Sport watch with red contrast, circular cutouts on hands, and logoed bezel
  • Also features speed timer, auto LED light, world time for 48 cities, daily alarm with snooze, countdown timer, stopwatch, 1/1000-second chronograph, day/date calendar
  • 51.2 mm resin case with mineral dial window
  • Quartz movement with display
  • Resin band with buckle closure
  • Water resistant to 200 m (660 ft): In general, suitable for professional marine activity and serious surface water sports, but not scuba diving

Display: Analog-Digital


Watch Movement Type: Quartz


Additional Features: Water Resistant


Power Source: Battery Powered


Strap Type: resin strap


Water Resistance Depth: 660 Feet


Sport Type: marine activity, water sports


Clasp Type: Buckle


Water Resistance Level: Waterproof


Embellishment Feature: Crystal


Closure Type: Buckle


Band Material Type: Resin


Case Material Type: Resin


Crystal: mineral


Case Diameter: 51.2 Millimeters


Band Width: 16 Millimeters


Case Thickness: 16.9 Millimeters


Bands: 1


Warranty Type: Manufacturer


Style Name: Modern


Shape: Round


Band Color: Black


Dial Color: Black


Theme: Sports


Face Style: Modern


Brand Name: Casio


Model Name: GA100-1A4


Included Components: User Manual, Warranty Card, Watch Box


Model Number: GA-100-1A4DR (G272)


Series Number: 100


Item Weight: 0.35 Pounds


Global Trade Identification Number: 24


Manufacturer: Casio


UPC: 079767443924


Manufacturer Part Number: GA100-1A4


Unit Count: 1.00 Count


Age Range Description: Adult


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Aug 28 – Sep 3

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

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View our full returns policy here.

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Similar Products

Top Amazon Reviews

    • I really like it.
Color: Black
I have had three of the same Timex Ironman watches over the years. The big problem that I had was that first the loop for excess band length would break--- that was easily remedied by using an o-ring to replace it. Then within a couple of months of that the band would always break. I have tried to find a replacement band without luck. Unfortunately the band has a non straight end that keys into the watch body which more or less prevents using an aftermarket band of any type. Plus I wanted something different. So this time around (no pun intended!) I decided on finding a watch that I can get a band for and over the holidays I saw a G-Shock at a local store and it stuck in my mind. This is for a everyday watch that I wear and the functions that really matter are time and date--- the rest is just the proverbial "added bonus". So I could not decide between this one and the one that is all black--- so with free returns I bought both as well as one other to try out. The other was fine, but simply too small in diameter. Maybe when I was in my teens it would work, but as an adult--- just didn't look large enough. So I sat both this one with the red and the all black side by side. I kept using the functions and it really came down to reality--- I need to be able to see the face as easily as possible. So the all black that has all black lettering and the black inverted display on the digital part--- I know it will bother me over time and I will learn not to like it. So I decided to keep this one. I do like the red accents and the buttons are clearly labeled plus the display may not be as sexy as the other in black, but it is easier to see all the time. And as far as the red hour hand being hard to see--- for me it is not a problem. I have made a point of looking at it at different parts of the day--- it is always normal to read. Yes the hands do get in the way of the digital readout at specific times of the day, but for me it is not a big deal. Overall styling is great for a resin type watch and it feels good on my wrist. As far as size, it is almost exactly 2" from button to button on the diagonal and is about 1/2" thick. I thought it may have been too big, but it is just right. As far as price--- compared to some similar watches in the same range--- I will stick with the G-Shock. I have also ordered a spare band so that when it does eventually break--- I will have a spare ready to go. For setup I never even read the book. Took less than 1-minute to do and the longest part was scrolling through the time zones and then remembering if we are on DST or not. As far as the backlight it is amber and factory set for 1-second. After reading another review on the all black version--- in the adjustment menu there is the option to change it to 3-second which I did. Again, easy to do and happy with it! ... show more
Reviewed in the United States on February 28, 2015 by The Goat
    • Good watch, few problems
Color: Black
Pros: the watch is durable, functional,customizeable, has a relatively simple manual, has a neat auto-light function (not extremely useful, but cool nevertheless), and is very stylish. Cons: the ones you've heard before: weak backlight(can be fixed by holding your finger over top half of watch while backlight is on). I don't know if others have experienced this, but my watch came with the speedometer hand off by a hair (fixable by navigating to time/date mode and holding "forward", then adjusting the hands to their 12 o'clock positions with "forward", "reverse" and "mode" buttons. Another minor con is the fact that the speedometer is not, in fact a speedometer, but a calculator of distance/time based on previously entered data. If I had done a little more research, this would've been clear to me. Overall, I would definitely recommend this watch to a friend (and have done so before), I haven't spent a day without it on. ... show more
Reviewed in the United States on March 2, 2012 by soccersquared
    • I like Watch Face ll
Color: Black
I got this watch in the mail today. I opened the box and loved the watch as soon as l tried it on. IL be the analog display, with the red acent around the Face of the watch. I like the red button on the side of the watch. It makes it stand out .its big but not to big.I have a medium size wrist and it fits great. Some people wrote reviews about the hour hand being a distraction. I see no problem at all with it.l just tried the back light and it works fine . They could made it better and made the digital part light up.But not a problem. I have 15 gshocks in all different price ranges. I have the Rangeman ,the king Gxw56-1bjf gshock the Dw5600e-1v and to many more to list.I am a gshock collector. I had the 1st one to hit the market in 1983.Take it from someone who knows about gshocks, and for $55.00 bucks at @amazon.com you won't be sorry. I promise you will love this watch it you like analog watches. ... show more
Reviewed in the United States on May 12, 2016 by Thomas frey
    • Awesome Watch
Color: Black
I received my Casio GA100 a few weeks ago - overall I'm very impressed!! It's large & bold but not overwhelming on my wrist - lightweight with a secure strap that looks cool too. Seems like a very durable watch and I'm comfortable wearing it when I'm active - I'm not worried about getting it wet (I just ruined a Valjoux Accutron in water - ouch). This watch is getting a lot of attention from others too. Setting the time was simple and I still need to study the details written in the manual for other functions - but the basic funtions are simple enough to figure out on my own. I wish the face was saphire but I have no issues (yet) and other reviews are encouraging. I've destroyed other sports watches and so far I'm very impressed with my new Casio. The LED night reading is a little difficult but I'm usually not desperate for timekeeping when it's pitch dark anyway.... The hour hand (red) is a little hard to read (compared to the silver minute hand). Price was attractive too - thanks Casio for an excellent product !!! I would highly recommend this watch. ... show more
Reviewed in the United States on June 23, 2011 by Markluke
    • Great Watch
Color: Black
Watch was in perfect Condition and all features are working fine. Price and Quickness of Watch arriving Was Great!
Reviewed in the United States on May 15, 2025 by Chris
    • Economia y calidad
Color: Black
agradable a la muñeca de buen material
Reviewed in the United States on April 7, 2026 by Oscar
    • It's a very good looking watch
Color: Black
I just received this watch. It's a very good looking watch. Like the GD100 model I own, it's light weight and very comfortable. The hands are very visible in the day time. I love the red and black combination. The back lighting at night could be improved. Holding your hand around the watch when the back light is on, improves the visibility of the hands at night. Forget viewing the digital screen at night. So far, from my short experience with G-Shock watches, they need to improve the back lighting of their Digi/Analog watches. Their digital watches have very good back lighting. Casio, why not use the same back lighting on the analog watches? They also need to make the alarm signal louder. Either that, or my hearing is beginning to go. If I need to see the time at night or in a theater, I'll wear my GD100 with the excellent blue back light, however during the day. there is no better looking watch than the GA100-1A4. ... show more
Reviewed in the United States on September 1, 2016 by Amazon Customer
    • Excelent Watch Excelent Watch
Color: Black
Review Image by Esaú
Review Image by Esaú
Review Image by Esaú
excellent seller, eating. Excelent Watch !!! 🤩🤩🤩
Reviewed in the United States on May 25, 2025 Reviewed in the United States on May 25, 2025 by Esaú

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