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G-Shock

Casio GA-2100 Series Wristwatch

  • Based on 1,546 reviews
Condition: New
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$109.99 Why this price?
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Availability: Only 1 left in stock, order soon!
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Arrives Oct 28 – Oct 30
Order within 21 hours and 49 minutes
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Package Dimensions ‏ : ‎ 7.87 x 4.37 x 3.23 inches; 1.8 ounces


Item model number ‏ : ‎ GA-2100-1A1JF


Department ‏ : ‎ mens


Batteries ‏ : ‎ 1 A batteries required. (included)


Date First Available ‏ : ‎ August 1, 2019


Manufacturer ‏ : ‎ G-Shock


Product Warranty: For warranty information about this product, please click here


Best Sellers Rank: #193,368 in Clothing, Shoes & Jewelry (See Top 100 in Clothing, Shoes & Jewelry) #497 in Men's Wrist Watches


#497 in Men's Wrist Watches:


Display: Analog


Watch Movement Type: Quartz


Additional Features: 200-meter water resistance


Power Source: Battery Powered


Strap Type: Band


Water Resistance Depth: 200 meters


Sport Type: Walking


Clasp Type: Buckle


Water Resistance Level: Water Resistant


Embellishment Feature: Crystal


Closure Type: Buckle


Style Name: Modern


Shape: Round


Band Color: Black


Dial Color: Black


Theme: Sports


Pattern: Classic Colors


Face Style: Analog-Digital


Character: Fashion


Brand Name: G-Shock


Model Name: 2100 Series


Included Components: User Manual, Warranty Card


Model Number: GA-2100-1A1JF


Series Number: 2100


Item Weight: 51 g


Unit Count: 1 Count


Model Series: 2100 Series


Manufacturer: G-Shock


Number of Items: 1


Age Range Description: Adult


Item Type Name: Casual Watch


Manufacturer Part Number: GA-2100-1A1JF


Band Material Type: Resin


Case Material Type: Resin


Crystal: Resin


Case Diameter: 45.4 millimeters


Band Width: 16 millimeters


Case Thickness: 11.8 millimeters


Band Length: 20.5 centimeters


Bands: 1


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Oct 28 – Oct 30

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.

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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Compliments from other watch lovers
Pattern Name: Classic Colors Color: Black
Quality watch. Light weight and luminosity makes the time easily visible. I got the all black and have gotten a lot of compliments
Reviewed in the United States on June 4, 2026 by Erin C
    • Beautiful, sleek, precise
Pattern Name: Classic Colors Color: Black
I am not a usual gshock user, but decided to pull the trigger after seeing all the mods this watch could get. It is amazing since its durable as hell, smaller than most gshocks and very nice looking. My dog chewed the hell out of it, and it barely caused several scratches. It would've killed my more expensive watches. I've had it for over a year and the battery is still strong! it has a tiny light that is useful if youre camping. ... show more
Reviewed in the United States on January 19, 2024 by Jose Abraham Ortiz
    • Queda muy bien
Pattern Name: Classic Colors Color: Black
Review Image by Brayan Romero
Reloj muy elegante
Reviewed in the United States on July 16, 2026 by Brayan Romero
    • Just what I wanted
Pattern Name: Classic Colors Color: Black
I like the size of this watch. It is a little smaller than some of the other G-Shocks, but I have a smaller wrist and the size is perfect for me. It looks great, but is still my “work watch”. I’ve already banged it up a few times working around the house, but seemed to have minimal scratches.
Reviewed in the United States on November 2, 2023 by Sal T.
    • Great but not perfect
Pattern Name: Classic Colors Color: Black
Review Image by Shawn Hughes
Review Image by Shawn Hughes
Review Image by Shawn Hughes
First off, the utility of this watch is as good as you could ask for. Just about any watch complication you could want, it offers. Day of the week, day of the month, year, daylight savings on/off option, stopwatch, timer, multiple alarms, 31 world time zone function. All while being easily accessible and simple to use and incredibly accurate time wise with down to the second setting. This G-Shock is comfortable, lightweight, and should accommodate the majority of wrist sizes with the tons sizing options on the band. Don’t let the 45mm case diameter be a deal breaker. This watch feels and looks much smaller on the wrist, especially with the less than 12mm of thickness. This is a rare time G-Shock could’ve increased the case size for the better. The GA2100 has a borderline endless supply of customization options from 3rd parties. New dial colors, Lume inserts, entirely new cases/bands featuring countless colors, silicone, and even metal bracelet options to dress this design up a bit. You could spend another $100 and easily have multiple combinations to style this watch. The durability should be a given considering it’s a G-Shock but I have zero concern that this won’t keep ticking for years on end even while enduring some significant use and wear and tear from everyday life. With all that said, it’s great but not perfect. Most of my dislikes and cons are because of legibility. I understand this a a blackout model but this colorway can be very difficult to read at times. The mineral glass is horribly reflective in natural and artificial light alike. The lume is only applied to the hands, not the indices, and although bright when initially charged the lume is pretty underwhelming and dulls quickly. The installed light basically only illuminates the digital subdial so if you choose not to display the time there it’s not ideal when checking the hour and minute hands in low light environments. A couple of other minor complaints: initial setup is a bit annoying. I received the JDM version. So the included paperwork was in Japanese. Only a quick search online was needed to find the necessary button combos for the functions. Once I saw it done a time or two it was surprisingly intuitive, and easy to remember. The buttons themselves can be a little challenging to press for people with larger fingers/hands but it’s barely worth mentioning. All in all, this watch is still worth the $100 price tag. I wouldn’t pay more personally. It does everything you could ask in a durable, attractive, no nonsense way. If you have to have this specific colorway, it may be worth while to make a few mods for better legibility if it is going to be your daily wearer. But at it’s core this watch is a workhorse that most will likely be happy with. ... show more
Reviewed in the United States on June 29, 2022 by Shawn Hughes
    • Muy bonito y funcional
Pattern Name: Classic Colors Color: Black
Increible
Reviewed in the United States on June 8, 2026 by Olmedo Zamora
    • Reloj practico y util
Pattern Name: Classic Colors Color: Black
Buen reloj, lo uso para el diario y funciona muy bien
Reviewed in the United States on December 9, 2025 by Julian Gonzalez
    • Good watch
Pattern Name: Classic Colors Color: Black
Very good, and sturdy watch, I’m impressed.
Reviewed in the United States on February 6, 2024 by DV

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