Pierre L. 15/10/2025
| Reference Ocarat | #121841 |
| Reference | GA-2100SR-1AER |
| Brand | Casio G-Shock |
| Product Type | Watch |
| Gender | Men |
| Color | Black Multicolor |
| Material | Synthetic |
| Material Quality | Resin |
| Warranty | 2 Years |
| Thickness (in mm) | 11,80 |
| Diameter (in mm) | 45,50 |
| Manufacturing | Japan |
| Warranty Type | International |
| Labels and Certificates | Authorized Retailer Special Edition |
| Case Shape | Octagonal |
| Case Weight (in g) | 51,00 |
| Watch Case Back | Case back secured by screws |
| Crystal Shape | Flat |
| Glass Quality | Mineral Crystal |
| Buttons | 4 Push Buttons |
| Water Resistance (in ATM) | 20 |
| Movements | Quartz |
| Movement Type | Japanese Movement |
| Movement Brand | Casio |
| Calendar and Time | Dates Days Hours Minutes Month |
| Chronograph Function | Yes |
| Timekeeping and Measurement | Chronometer Chronometer - 24 Hours Chronometer to 1/1000th of a second Countdown Day Counter Hacking Seconds Device |
| Alarm Complications | 24h Alarm |
| Alarm-Wake Up | Yes |
| Power Reserve (Maximum Duration) | 3 years with 1 battery |
| Display Type | Analog (hands) Digital |
| Display Specifications | Indices and railroad track LED Luminescent Hands Neobrite |
| Number of Counters (Additional) | 1 |
| Bracelet Material | Resin |
| Strap Color | Black |
| Water Resistant | Yes |
| Watch Clasp | Tang Buckle |
| Lug Width (in mm) | Special - Custom |
| Activities | Running Swimming / Diving Yachting / Sailing |
| Connectivity and Display | Backlight |
The Casio G-Shock Iridescent Colors GA-2100SR-1AER is a bold timepiece that embodies a contemporary, decidedly masculine spirit. Made in Japan, it features a robust and modern design with an octagonal black resin case measuring 45.50 mm in diameter and 11.80 mm thick. This distinctive design - a favorite among G-Shock enthusiasts - delivers a strong wrist presence while keeping the weight to just 51 g, ensuring outstanding comfort for all-day wear. The flat crystal covering the dial is made of mineral glass, chosen for its durability and its ability to effectively protect the watch's interior while offering a clear view of the dial details.
The dial of this watch stands out with its multicolor iridescent finish. This type of finish causes the dial to subtly shift colors under different lighting angles, creating a captivating visual effect. At the heart of this design lies a smart, modern approach to timekeeping, with luminous analog hands that deliver exceptional visibility even in the dark. The indices are arranged in a railroad-track pattern, lending a classic style that contrasts beautifully with the dial's modern iridescence. Completing the picture, an LED backlight further enhances visibility in low-light conditions - an essential feature for night-time adventurers.
Dual Illuminator: When the electroluminescent backlight activates, both the digital and analog zones of the dial are illuminated.
World Time Function: The world time function displays the current time in 29 time zones and major cities around the world.
1/100-Second Stopwatch - 24 Hours: Measures elapsed time with 1/100th-of-a-second precision over a maximum duration of 24 hours. An audible signal confirms when the stopwatch starts and stops.
Countdown Timers - 1-Second Increments - 24 Hours: For those who demand precision: the countdown timers alert you to important or recurring events with an audible signal at the set date and time. The time can be programmed in seconds, up to a maximum of 24 hours in advance.
Daily Alarm: The daily alarm goes off every day at the time you set. The value shown indicates the number of daily alarms available.
Hand Shift Function: This function allows you to move the hands out of the way when they obstruct the visibility of the time, date, or stopwatch display.
12/24-Hour Time Format: You can display the time in either 12-hour or 24-hour format.
Key Beep On/Off: The key beep can be disabled using the mode button. Once deactivated, no beep sounds when switching between functions. However, any programmed alarms or countdown timers remain active after the key beep is turned off.
Neobrite: The hands and/or indices feature a fluorescent coating that continues to glow in the dark after the watch has been exposed to a light source.
The Casio G-Shock Iridescent Colors GA-2100SR-1AER is powered by a Japanese quartz movement, delivering reliable accuracy and superior durability. This Casio movement is renowned for its robustness and longevity, integrating various complications that enrich its feature set - including displays for the day, date, and month. The watch also features a chronograph accurate to 1/1000th of a second, a highly sought-after function among sports enthusiasts. Stopwatch capabilities extend up to 24 hours, enabling long-duration measurements. It also includes a 24-hour alarm for reliable reminders of daily commitments.
The strap of this watch is crafted from black resin, chosen for its durability and wear resistance while delivering a clean, modern look. Resin is also valued for its everyday comfort, conforming naturally to the contours of the wrist. The strap is secured with a black pin buckle for quick and secure adjustment. This combination of materials and colors gives the watch a sporty edge while keeping it well-suited for intensive use across a variety of environments.
With a water resistance rating of 20 ATM, this G-Shock watch is built to withstand extreme environments - from scuba diving to high-intensity water sports. This is made possible by its rugged resin case and screw-back caseback, ensuring exceptional resistance to water pressure down to 200 meters deep.



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Pierre L. 15/10/2025
Iridescent Colors GA-2100SR-1AER Watch
(Ref. 121841)
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