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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Casio’s TRN-50SS and G-SHOCK GMW-B5000SS are two distinct takes on the brand’s 50th-anniversary “Sky and Sea” theme. The TRN-50SS revisits the original Casiotron QW02 in a smaller, lighter design with 50-meter water resistance; the full-metal GMW-B5000SS-2 applies blue-and-gold anniversary details to the classic G-SHOCK shape and has 20-bar water resistance. Casio announced the collection on May 21, 2024, and released it in Japan on June 7, 2024. The published specifications establish their differences on paper, but do not establish how either watch feels or performs during wear.
How the two anniversary watches differ
Both models use blue and gold accents, but they draw on different chapters of Casio history. The TRN-50SS follows the Casiotron TRN-50 and references the QW02, Casio’s first wristwatch. The GMW-B5000SS-2 starts with the full-metal GMW-B5000, which carries the form of the first G-SHOCK.
| Feature | Casiotron TRN-50SS | G-SHOCK GMW-B5000SS-2 |
|---|---|---|
| Design basis | TRN-50, re-creating design cues from the Casiotron QW02 | Full-metal GMW-B5000, with the classic first G-SHOCK form |
| Anniversary details | Gold clasp fold with a triangle motif drawn from the original case back | Blue bezel treatment, gold fluted dial perimeter and side buttons, anniversary case-back marking, and bicolor clasp |
| Case dimensions | 42.7 × 39.1 × 12.3 mm | 49.3 × 43.2 × 13 mm |
| Weight | Approximately 111 g | 167 g |
| Water resistance | 50 m | 20 bar |
| Time setting | Radio reception and Bluetooth Mobile Link | Multiband 6 and Bluetooth time adjustment |
| Power | Tough Solar | Tough Solar |
| Japanese launch list price | ¥69,300 including tax | ¥93,500 including tax |
Specifications and design details are from Casio’s [May 21, 2024 international announcement], [G-SHOCK Europe model page], [Japan GMW-B5000SS-2 listing] and [Japan TRN-50 announcement]. The prices are Japanese launch figures from 2024, not current prices or a universal retail price.
What the TRN-50SS brings
A Casiotron anniversary design
The TRN-50SS takes its design from the TRN-50, itself a modern reference to the Casiotron QW02. Casio’s announcement identifies the QW02 as its first wristwatch, released in 1974. The anniversary treatment includes a gold clasp fold and a triangle motif inspired by the original watch’s case back.
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#1 Best Overall
- 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.
Published specifications
- Case dimensions: 42.7 × 39.1 × 12.3 mm.
- Approximate weight: 111 g.
- Water resistance: 50 m.
- Time features: radio time reception and Bluetooth Mobile Link.
- Power: Tough Solar charging.
These measurements and features come from Casio’s international Sky and Sea announcement and its February 15, 2024 Japan TRN-50 announcement. They describe the published product, not a hands-on assessment of comfort, fit or day-to-day usability.
What the GMW-B5000SS-2 brings
Full-metal G-SHOCK with anniversary accents
The GMW-B5000SS-2 gives the full-metal GMW-B5000 a blue-and-gold anniversary treatment. Casio highlights a fluted dial perimeter inspired by the Casiotron, gold side buttons, an anniversary-engraved screw-lock back and a two-tone clasp. It retains the recognizable GMW-B5000 form.
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.
Published specifications
- Case dimensions: 49.3 × 43.2 × 13 mm.
- Weight: 167 g.
- Water resistance: 20 bar.
- Time setting: Multiband 6 radio reception and Bluetooth time adjustment.
- Power: Tough Solar.
These are the specifications on Casio Japan’s GMW-B5000SS-2 product page. The model suffix matters: this listing is specifically for the Japan-market GMW-B5000SS-2.
Which one fits your priorities?
- Choose by design lineage: the TRN-50SS is the Casiotron-focused choice; the GMW-B5000SS-2 is the anniversary version of the full-metal G-SHOCK form.
- Compare the stated dimensions and mass: the TRN-50SS is listed at approximately 111 g and 42.7 × 39.1 × 12.3 mm; the GMW-B5000SS-2 at 167 g and 49.3 × 43.2 × 13 mm. Those figures establish a size and weight difference, not which will feel better on a particular wrist.
- Check the water-resistance rating against your needs: Casio lists 50 m for the TRN-50SS and 20 bar for the GMW-B5000SS-2. The ratings are expressed differently, so do not treat the numbers as identical units.
- For time setting and charging, both list Bluetooth connectivity and Tough Solar; the GMW-B5000SS-2 additionally names Multiband 6, while the TRN-50SS announcement describes radio time reception.
Launch prices and release date
Casio Japan’s May 21, 2024 announcement listed June 7, 2024, as the collection release date and launch prices including tax of ¥69,300 for the TRN-50SS and ¥93,500 for the GMW-B5000SS. Casio Japan’s GMW-B5000SS-2 page also lists ¥93,500 including tax. These are Japanese launch prices, not a guide to current availability or resale value.
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
Casio’s announcement of the collection is available at Casio Japan; the international overview is at Casio International.
Quick Recap
Best Value
- Sport Type: Scuba Diving
Rank #4
- Band Size: Mens-Standard
- Shock Resistant
- Auto LED Light with Afterglow
- Magnetic Resistant
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.
