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Created with Eselt Mobile Optimized Templates for eBay Sellers
Created with Eselt Mobile Optimized Templates for eBay Sellers

Casio G-Shock GA-2100-1A1ER CasiOak – Rainbow Mod – Custom Build

The Watch

The “CasiOak” needs no introduction. Even over a year after its launch, it still remains one of the hottest watches around.

This watch is a customised Casio G-Shock GA-2100-1A1ER, brand new and never worn. This modification splashes the full spectrum of colour to the hour indices and embossed text on the case bezel. Comes with its original box, with all contents and tags.

Stand out from the crowd with this gorgeous, customised CasiOak!

But why THIS “Rainbow” CasiOak?

Let’s not pretend: this is probably not the first “Rainbow” CasiOak you’ve seen. However, this might as well be the best choice for acquiring one:

Great value: We are confident that the price-to-quality ratio of this custom build is better than alternative options.

 Using only the finest quality materials: high-end paint has been used in multiple layers and sealed with matte protective varnish (offering protection from the elements and blending the painted parts with the matte finish of the dial).

 Attention to detail: all paintwork was carried out by hand to a very high standard (just look at the pictures!) and great care is taken when working with watches and ensure all parts of the watch remain in pristine condition during the customisation/build procedure.

Hand-Painted Watch Disclaimer and Care

Each watch is hand-painted in the UK, using the exact same colours shown in the pictures and finished to the same high standard. However, due to the process being 100% done by hand, extremely minor differences might exist between the watch you receive and the watch in the pictures. Rest assured that all watches undergo close inspection before being dispatched. The colours you see in the pictures are the exact colours you get on your custom watch!

Please keep the painted parts away from solvents (such as ethanol, isopropyl alcohol, acetone, lighter fluid etc.) as it will damage the paintwork. Exposure to water should not strip the paint, but it is recommended to keep exposure to water (including soap water and seawater) a minimum. Do not stick solid objects (such as toothpicks and needles) in the embossed coloured letters on the bezel, as this can damage the paintwork.

Casio G-Shock GA-2100-1A1ER Technical Details

Size of case: 48.5×45.4×11.8mm
Total weight: 51g
Case/bezel material: Carbon/Resin
Resin Band
Mineral Glass
Shock Resistant
Carbon Core Guard structure
0-meter water resistance
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 99)
12/24-hour format
Button operation tone on/off
Regular timekeeping
Analog: 2 hands (hour, minute (hand moves every seconds)), 1 dial (day)
Digital: Hour, minute, second, pm, month, date
Accuracy: ±15 seconds per month
Approx. battery life: 3 years on SR726W × 2

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Additional information

With Original Box/Packaging


With Papers


Year Manufactured




Strap Material




Case Colour




Lug Width

19 mm

Case Size

45 mm

Case Material


Water Resistance

200 m (20 ATM)

Strap Type

Two-Piece Strap



Strap Colour


Dial Colour



Sport, Casual


Water-Resistant, Mineral Crystal, Luminous Hands, Shock-Resistant, Luminous Dial, Backlight, Magnetic-Resistant, Acrylic Crystal, LED Display, Splash Proof, Scratch-Resistant



Reference Number





Casio G-Shock

Case Finish



Analogue & Digital




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