G-Shock
"CasiOak" Octagon Carbon Core Guard Black
GA2100-1A1
or 4 payments of $33.25
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"CasiOak" Octagon Carbon Core Guard Black
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Extended gift returns & exchanges: order by 31 Dec, return or exchange until 31 Jan 2027. Details
"CasiOak" Octagon Carbon Core Guard Black
or 4 payments of $33.25
- Repay in 4 installments fortnightly, interest-free.
- The maximum purchase amount is $3,000.
- Learn more about Afterpay
"CasiOak" Octagon Carbon Core Guard Black
Register to receive a notification when this item comes back in stock.
Overview
- Case size
- 45.4 mm
- Movement
- Quartz
- Functions
- Alarm
- Date display · Shockproof +1
The G-Shock CasiOak GA2100-1A1 is a bold fusion of rugged performance and refined design, built for those who demand precision and resilience.
This men's watch features a distinctive octagonal bezel and ultra-slim 11.8mm carbon-reinforced resin case, delivering iconic shock resistance in a sleek, low-profile form. The matte black dial combines analog and digital displays, offering world time, stopwatch, countdown timer, five alarms, and full auto-calendar with 12/24-hour format. Ideal for everyday wear or active pursuits, its mineral glass, resin band, and Carbon Core Guard structure provide exceptional durability. Water-resistant up to 200 meters, this sport watch remains effortlessly stylish under pressure.
Specifications
- Case / bezel material
- Carbon / Resin
- Gender
- Male
- Band type
- Black Resin
- Features
- Shock Resistant
- Carbon Core Guard structure
- Mineral Glass
- 200-meter water resistance
- Resin Band
- 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 zones (48 cities + coordinated universal time), daylight saving on/off
- 1/100-second stopwatch
- Measuring capacity
- 00'00''00~59'59''99 (for the first 60 minutes)
- 1:00'00''~23:59'59'' (after 60 minutes)
- Measuring unit
- 1/100 second (for the first 60 minutes)
- 1 second (after 60 minutes)
- Measuring modes
- Elapsed time, split time, 1st-2nd place times
- Countdown timer
- Measuring unit
- 1 second
- Countdown range
- 24 hours
- Countdown start time setting range
- 1 second to 24 hours (1-second increments, 1-minute increments and 1-hour increments)
- 5 daily alarms
- Hourly time signal
- Hand shift feature
- Full auto-calendar (to year 2099)
- 12/24-hour format
- Button operation tone on/off
- Regular timekeeping
- Analog
- 2 hands (hour, minute (hand moves every 20 seconds)), 1 dial (day)
- Digital
- Hour, minute, second, pm, month, date
- Accuracy
- ±15 seconds per month
- Approx. battery life
- 3 years on SR726W × 2
- LED
- White
Built not to break
A module that floats
Inside a hollow case, the module (the heart of the watch) seems to float, so knocks from outside are softened before they reach it. The idea came from watching children play with a rubber ball.
2-year warranty
Every G-SHOCK watch from Watch Direct comes with a 2-year warranty from Shriro Australia, Casio’s exclusive Australian distributor.
Watch Direct is an authorised G-SHOCK retailer, trading since 2011.
About G-SHOCK
G-SHOCK began with a dropped watch. Casio designer Kikuo Ibe saw a watch break when it fell, and proposed “a durable watch that would not break even if dropped”. The project set itself the “Triple 10” goal: survive a 10-metre drop, resist water to 10 bar and run for 10 years on one battery. The first G-SHOCK, the DW-5000C, arrived in 1983.
Shop all G-SHOCK
Reviews
Shipping & Returns
Free Shipping Anywhere in Australia
- Get Your Order Shipped in Record Time - Most Orders Sent Within 24 Hours!
- Efficient Same Day Delivery in Sydney - Calculated at Checkout
- Signature on Delivery is included on all shipments within Australia.
- DHL Express is available for fast and secure international shipments.
View our Shipping Page for More Information
Returns Policy
Holiday gift returns: orders placed 1 November to 31 December 2026 can be returned or exchanged until 31 January 2027.
To be eligible for a return, your item must be in the same condition that you received it, unworn or unused, with tags, and in its original packaging. You’ll also need the receipt or proof of purchase.
View our Returns Page for More Information