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Casio’s black-and-red G-Shock lineup includes three references: the GMA-S120RB-1A, GMA-S2100RB-1A and GMD-S5600RB-4. Casio describes a glossy metallic finish on the GMA-S120RB and GMD-S5600RB; the GMA-S2100RB is an octagonal-bezel analog-digital model. The product pages establish their designs, but do not confirm a recent launch date.
Which black-and-red G-Shocks are included?
The three references differ in display format and case design. Casio’s product descriptions identify a metallic gloss specifically on two of them, rather than presenting that finish as a shared feature of all three.
| Model | Display and design | Color and finish | Availability label on cited Casio page |
|---|---|---|---|
| GMA-S120RB-1A | GMA-S120 model; display details not stated on the cited US product page. | Black and red; Casio describes a glossy metallic finish. Casio US | Discontinued on Casio’s US page. Casio US |
| GMA-S2100RB-1A | Analog-digital display with an octagonal bezel. Casio Singapore | Black-and-red group; a glossy metallic finish is not specified for this reference. Casio Singapore | Not stated on the cited Casio Singapore page. Casio Singapore |
| GMD-S5600RB-4 | Digital display. Casio Singapore | Black and red; Casio describes a glossy metallic finish. Casio Singapore | Old model on Casio’s Singapore page. Casio Singapore |
What does the metallic finish look like?
Casio describes the design treatment as “A glossy metallic finish adds an extra touch of sophistication to the GMA-S120RB and GMD-S5600RB.” The detail applies to those named references; the available product information does not identify the GMA-S2100RB as having the same finish. The red-and-black palette links the trio, while their different case shapes and displays give each a distinct look.
What specifications are listed for the GMD-S5600RB-4?
Casio’s Singapore product page lists a resin case and band, 200-meter water resistance, and an approximate battery life of three years using a CR1616 battery. These are manufacturer specifications for the GMD-S5600RB-4, not independent test results. See Casio’s GMD-S5600RB-4 specifications.
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- Rugged & Sporty Design – Matte black finish with bold digital display, built for tactical, military, and extreme sports enthusiasts.
- High-Brightness LED Backlight – Features Super Illuminator LED with a light guide plate, ensuring exceptional visibility in low-light conditions.
- 200M Water Resistance – Engineered for swimming, snorkeling, and outdoor adventures, this shock-resistant watch is ready for action.
- Extended 7-Year Battery Life – Powered by a CR2025 battery, offering years of reliable performance without frequent replacements.
- Shock-Resistant Structure – Built to withstand extreme conditions, making it ideal for sports, military, and rugged outdoor use.
Did Casio just launch these watches?
The cited product pages confirm the model names and design details, but do not establish when the watches were announced or launched. They therefore do not support describing the trio as a newly announced 2026 release. Availability labels also vary by market: the US page marks the GMA-S120RB-1A discontinued, while the Singapore page calls the GMD-S5600RB-4 an old model. Neither label determines whether a watch is available in another country, and product-page status can change.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Which model should you look at?
- For an octagonal bezel and analog-digital display: the GMA-S2100RB-1A is the identified option.
- For the specifically described glossy metallic treatment in a digital model: consider the GMD-S5600RB-4.
- For the glossy metallic GMA-S120 design: the GMA-S120RB-1A is the relevant reference, though Casio’s US page labels it discontinued.
Check the exact reference and local seller listing before buying. The cited Casio pages do not provide a unified current price or confirm present-day stock across markets.
Quick Recap
Best Value
- Sport Type: Scuba Diving
Rank #4
- Band Size: Mens-Standard
- Shock Resistant
- Auto LED Light with Afterglow
- Magnetic Resistant
Rank #3
- Super Matte Finish, Shock Resistant, 200M water resistance, LED light (Super illuminator), World time, Stopwatch, Countdown timer, 5 daily alarms, Hourly time signal, Hand shift feature
- Full auto-calendar, 12/24-hour format, Analog: 2 hands (hour, minute (hand moves every 20 seconds)), Digital: Hour, minute, second, pm, month, date, day, Approx. battery life: 5 years on CR2016
- Quartz Movement
- Case Diameter: 52.8mm
- Water resistant 200m (660ft): in general, suitable for professional marine activity and serious surface water sports, but not diving
Rank #2
- Shock-Resistant Durability: Built to withstand the toughest conditions, this G-Shock watch features a rugged resin case and bezel, perfect for outdoor adventures and extreme sports.
- 200M Water Resistance: Designed for water enthusiasts, it’s suitable for scuba diving, swimming, and snorkeling, providing reliable protection up to 200 meters.
- Electro-Luminescent Backlight: The blue-green EL backlight with afterglow ensures clear visibility of the time, day, and date, even in complete darkness.
- Precision Stopwatch & Countdown Timer: Measure elapsed and split times with the 1/100-second stopwatch, or set up a countdown timer with up to a 24-hour range, ideal for timing workouts or daily tasks.
- Multi-Alarm with Flash Alert: Stay on schedule with a customizable alarm, hourly chime, and flash alert that combines light and sound for added convenience.
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
