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Returnable until Jan 31, 2026
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Availability:
Only 5 left in stock, order soon!
Arrives
Jan 30 – Feb 15
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Color: White/Black
Is Discontinued By Manufacturer : No
Product Dimensions : 6 x 6 x 7 inches; 5.93 ounces
Item model number : GA100B-7A
Department : mens
Batteries : 1 Lithium Metal batteries required. (included)
Date First Available : September 22, 2011
Manufacturer : Casio America Inc.
Best Sellers Rank: #45,473 in Clothing, Shoes & Jewelry (See Top 100 in Clothing, Shoes & Jewelry) #182 in Men's Wrist Watches
#182 in Men's Wrist Watches:
Brand, Seller, or Collection Name: Casio
Model number: GA100B-7A
Part Number: GA-100B-7ACR
Model Year: 2020
Item Shape: Round
Dial window material type: Mineral
Display Type: Analog-Digital
Clasp: Buckle
Case material: Resin
Case diameter: 5.1 centimeters
Case Thickness: 16.9 millimeters
Band Material: Resin
Band size: Men's Standard
Band width: 29.4 millimeters
Band Color: White
Dial color: Black
Bezel material: Resin
Bezel function: Stationary
Calendar: Day-Date-Month
Special features: Shock Resistant, Anti Magnetic Seal, Water Resistant
Movement: Quartz
Water resistant depth: 660 Feet
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Jan 30 – Feb 15
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Color: Black/Blue
Love this Watch!! Comfortable and Fashionable
Reviewed in the United States on November 5, 2025 by Travis Crider
Color: Black/Red
Great size and functionality super durable good value
Reviewed in the United States on September 28, 2025 by Logan Werner
Color: Black/Blue
Solid watch and beautiful in the sunlight
Reviewed in the United States on October 17, 2025 by larry
Color: Black/Green
Excellent watch, the background is a bit dark but the night light is sufficient, take advantage of the offer.
Reviewed in the United States on October 30, 2025 by Pedro Etayo Pedro Etayo
Color: Foam White
I got the white version of the GA-100 series (it's kind of gray to be honest, not bright white, but it's a good color). This is a large, reliable, dual analog/digital watch with a lot of features, including the unique ability to set a secondary time zone that you can switch to quickly if you travel across state lines a lot, or to a different country once a month, or something of that nature. For the past four and a half months I've worn this watch constantly - washing my hands, in the shower, going to sleep, working out, and it's lasted through all of that flawlessly without issue. I only took it off a handful of times in that whole period until I bought my DW5600 (more on that later). I haven't gone swimming with it on yet, since it hasn't been swimming season, but I would do so in a heartbeat, and I completely trust the watch to last through any submersion in water outside of deep diving. It's a bulky watch, there's no doubt about that, and it does have a tendency to slam into doorframes and the like, but thankfully I have zero fear of this watch being damaged by impacts such as those because of how sturdy it is - for example, it seems basically impossible to accidentally scratch the glass because it has a raised edge around it. It's really not that heavy either, and I have very large wrists, so it was the perfect size and fit for me and not a giant brick on my wrist like it seems - in the picture you can see the size comparison with the standard issue G-Shock, the DW5600, and how much bulkier it is in comparison. It's both thicker and wider, but after wearing this model on my wrist for so long, the DW5600 seems kind of small in comparison. I think I like how the GA-100 wears better. However, note that I got the GA-100 first, and the DW5600 was purchased as effectively a replacement. There were a few reasons for this. The number one reason is that I needed to read the time in the dark, and I have a hard time reading an analog face (especially when I'm laying in bed half asleep at 4am), and the light on this watch is completely awful and only shines a skewed LED bulb light on the analog face with no backlighting. This makes it pretty hard to tell the time at night, and because the digital faces are not lit up, it's completely impossible to see what the date or day of the week is either. I also was almost completely reliant on the digital display to read the time the rest of the day anyways, and during certain times of day (7-9 o'clock and 35-45 minutes) the hands obscured the digital display which gives the time, forcing me to take an extra few seconds to read the analog face. The only reason I bought the analog face watch was because I wasn't yet comfortable wearing an all-digital watch in terms of style, but after awhile I just wanted to know what the time was and this design flaw was getting in the way. People also complain about the digital displays being negative (white on a black background), and while this is definitely less legible than a regular black on white display as you can see in any picture, I actually didn't find it too hard to read as long as there was normal room or outdoor lighting. Pictures make it look a lot worse than it is in real life. Though, oddly, the bottom right display, which shows the seconds and the day of the week, was always notably darker than the bottom left display, but still legible. As a budding fan of Casio watches/G-Shocks, this GA-100 series is probably the perfect entry point for someone who is on the fence like I was about getting a fully digital watch, but wants all the reliability and upside of having a G-Shock. I think this watch definitely deserves 4 stars just because I've truly put this watch through hell, and besides just the most subtle little discoloration on the white resin (which 99.99% of which went away after dropping in a cup of soapy water and scrubbing with a sponge), the watch seems like it can survive literally anything. In my personal opinion, if you can stand that 90s look of a regular LCD display with black characters on white/off-white background, I would suggest one of the other colorings of this model with a non-negative digital display for the best legibility. It should also be noted I got this watch for $75, and the price has increased since to $99, which is a much worse deal than what I paid for it. If you want just pure, absolute functionality and you can stand a digital display watch, I would suggest any of the digital face Casio models instead of the ones with an analog-digital combo such as this one - and they'll generally be cheaper, too. Assuming you don't mind having a recessed and harder to press "adjust" button (top left button used to set the time, change timers, and reset the stopwatch), the DW5600 is the gold standard for digital watches and costs $40 right now on Amazon. My absolute favorite pick instead of this watch or the DW5600, though, would be the DW290, which may not be a G-Shock in name but has literally all of the same features, same digital face, and same water resistance anyways (and does not have a recessed "adjust" button design flaw, from what I've read people say), and skews cheaper than either of the two other watches. That watch will be my next purchase for sure, and not another one of these combo digital-analog models, sadly.
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Reviewed in the United States on April 17, 2022 by Nicole Nicole
Color: White/Black
I love the white color on this watch. It’s so easy to read, it’s lightweight, and the hour markers look amazing and I really like the blue accent around the dial. I’ve had the all black version of this watch and it’s been great too, but I’m in love with this white one. I don’t know why people complain about the light not lighting up the lcd display. When do you need to use a timer or stopwatch in the dark?? The light is plenty good enough to show you the time when you wake up in the middle of the night. 5 stars.
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Reviewed in the United States on June 5, 2025 by Old White Guy Old White Guy
Color: Black/Green
This is a fantastic watch. It is functional, sturdy, & alluring. The GA-100 models are some of the most appealing & versatile watches that Casio offers. I received a fake several years back (NOT from Amazon) & having never previously owned a G-Shock, its authenticity was initially not under suspect. I obliviously wore this imposterous gadget for a few months before becoming completely exasperated with its baffling time keeping inconsistencies. The hands would randomly change their positions when I used basic functions, so I’d have to reset them several times a week. After I had my fill of this ridiculousness, I tossed it into an old shoebox & forgot all about it until it recently resurfaced. Now that I own several G-shocks, my accrued familiarity helped me in recognizing that something wasn’t right (plastic crystal being a major telltale), & I soon knew it for what it was. I decided to get the real artifact in order to remove the taste of artificial G-shock outta my mouth, & it did. Instantly. This watch is a sight to behold & a joyance to wear. I have a 7 & 1/2 inch wrist & prefer larger watches, & the size did not disappoint. The detail & geometry within the dial are well done, as well as the deceptive simplicity of its operation. Ain’t nothing like the real thing.
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Reviewed in the United States on September 8, 2024 by Skulsplttr76 Skulsplttr76