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G-Shock

GMAS2100-1A

Based on 273 reviews
Condition: New
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$79.78
Save $19.22 was $99.00

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This item's return window has been extended for the holiday season: FREE refund/replacement until Jan 31, 2027

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Availability: Only 4 left in stock, order soon!
Fulfilled by Watchsavings
Arrives Thursday, Nov 12
Order within 17 hours and 46 minutes

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At a glance

Condition
New
Model
GMAS2100-1A
Dimensions
8 x 5 x 5 in; 4.8 oz
Weight
4.8 oz
Batteries
1 LR44 batteries required.
Display
Analog-Digital
Watch Movement Type
Japanese Quartz
In the box
Band

Description

From Casio G-Shock, this new GMAS2100 watch is a downsized version of the GA-2100 model. It is slim, lightweight, and compact in design and boasts a chic, monochromatic look. The octagonal bezel, flat face, simple bar hour markers, and carbon core guard structure that are distinctive features of the GA-2100 are now available in a compact configuration. The black resin strap and matching dial with rose gold-tone accents adds a feminine pop of color to this new style.Shock Resistant200-meter water resistanceCarbon Core Guard structureCase/bezel material: Carbon/ResinBlack Resin BandMineral Glass Neobrite Double LED light LED light for the face (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)LED backlight for the digital display (Super illuminator, selectable illumination duration (1.5 seconds or 3 seconds), afterglow)World time - 31 time zones1/100-second stopwatchCountdown timer5 daily alarmsHourly time signalHand shift featureFull auto-calendar (to year 2099)12/24-hour formatButton operation tone on/offRegular timekeepingSize of case : 46.2?42.9?11.2mmCasio Style : GMAS2100-1A

Specs 47

Product Dimensions 8 x 5 x 5 inches; 4.8 ounces
Item model number GMAS2100-1A
Department Watches
Batteries 1 LR44 batteries required.
Manufacturer G-Shock
Product Warranty For warranty information about this product, please click here
Display Analog-Digital
Watch Movement Type Japanese Quartz

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Nov 12

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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  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

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Top Amazon Reviews

Casios are great
I reallh like the color combination. It makes for a subtle yet visually attractive time piece
Reviewed in the United States on September 14, 2026 by Will W
Great watch for wife
My wife wanted another G shock but she doesn't like Baby G shocks and she wanted something that was fitting for her work place. She saw these come out and she liked the black one. I bought it as a gift and it 100% met her expectations. It's a good size for a small wrist. It doesn't say Baby G on it which is a turn off for some people. The black is a nice shade for a clean look and the rose gold like accents give the watch a little something so it fits in well in a work environment and jewelry coordination. If it was like the all black larger version it would be too tacti-cool for some settings. It's super light and it reads well. This watch definitely fulfills every bit of its specs, advertising and online appearance. Sometimes it's hard to tell how a watch will look in person and on the wrist but this one was spot on. If you are liking it but are unsure, spring for it. It meets the hype, and some. ... show more
Reviewed in the United States on July 14, 2021 by averageguy
Great
Review Image by Alacr1cy
Great, just didn’t come with the original box, but it’s an original watch
Reviewed in the United States on June 25, 2026 by Alacr1cy
Good looking for site work, light weight, good view on display, hard to adjust time
Good looking for site work, light weight, good view on display, hard to adjust time but I made it.
Reviewed in the United States on April 11, 2026 by Hyun
ez to use and looks good
fire
Reviewed in the United States on July 31, 2026 by Steven M.
200m water resistance. Strap broke first swim
This was my first G-shock. I bought it to go camping with my son. First swim in the lake, I felt it detach on the top of my wrist and I saw it drift down to the bottom. This is NOT a well made watch. I’m sure the thing will tell perfect time for 10 years on the bottom of this lake but I spent 100 bucks on wearing a watch for 8 hours. NOT a well made watch. ... show more
Reviewed in the United States on July 30, 2026 by William C Paddock
Bonito Reloj para mujer
Reloj para mujer
Reviewed in the United States on August 10, 2026 by Camilo Vasquez
Women size
A Perfect woman size GShock
Reviewed in the United States on July 1, 2026 by Sean Chon McCall
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