Orient Kamasu “Shake” Men’s Automatic GMT Watch RA-BC0004Y (42.8 mm, Salmon-Orange Dial, Sapphire Crystal, Dual Time Zone GMT, 200 m Diver, SUS316L Stainless Steel)

The Heroic Return of the “Shake” (鮭 - The Japanese Wild Salmon)

In the folklore and natural world of northern Japan (especially along the frigid coasts of Hokkaido and Tohoku), the “Shake” (鮭 - the wild salmon) is revered as the most tireless navigator of the aquatic realm. Born in freshwater streams, it embarks on a titanic oceanic journey of thousands of miles across the Sea of Okhotsk and the North Pacific, defying predators and icy currents for years before undertaking its instinctive return, upstream and against the current, to its exact point of origin.

That spirit of a tireless marine explorer who never forgets his home makes the Shake the perfect embodiment of a GMT watch: a timepiece designed to sail across oceans and traverse time zones (local time) while always keeping the time at the point of departure (home time) in sync. Its dial features a vibrant orange hue with warm salmon undertones—the color that symbolizes the fish’s vital energy and biological resilience—offering a striking contrast to the technical bezel and the sharp fangs characteristic of the Kamasu lineage (the Japanese barracuda).

Technical Specifications

Feature Technical Detail
Reference RA-BC0004Y (Kamasu Diver GMT “Shake”)
Main Function Professional Diver’s Watch with GMT complication (Simultaneous dual time zones)
Movement Origin Japan (Japan Movement)
Movement In-house automatic mechanical movement with manual winding and hacking seconds
Caliber Orient F6P22 (22 jewels)
Power Reserve Over 40 hours
Accuracy +25 to -15 seconds per day
Case Dimensions 49.5 mm (lug-to-lug) × 42.8 mm (diameter without crown) × 13.4 mm (thickness)
Width Between Lug 22 mm
Total Weight 177 g
Case Material Solid stainless steel with a protected screw-down crown and a screw-down solid caseback
Crystal Flat sapphire crystal with maximum scratch resistance
Bezel Rotating with 24-hour/dive scale and luminescent dot at 12 o’clock
Dial High-saturation “Shake” salmon orange with a separate 24-hour GMT hand
Luminescence High-intensity photoluminescence on hands (including the GMT hand), hour markers, and bezel pearl
Bracelet SUS316L marine-grade stainless steel (wrist size: 140 mm to 200 mm)
Closure Type Triple-fold deployant clasp with double pushers and a safety locking tab
Water Resistance 200 Meters / 20 Bar (suitable for water sports, swimming, and scuba diving)
Magnetic Resistance Japanese Industrial Standard (JIS) Class 1 (resistance greater than 4,800 A/m)
Complications Central fourth GMT hand (24-hour) and date window at 3 o’clock

Key Selling Points

• GMT Complication for Travelers and Explorers: Designed to coordinate two time zones in real time without mental calculations, thanks to the in-house F6P22 caliber and its independent 24-hour hand.
• Trendy Salmon-Orange Dial: The “Shake” shade draws on the cherished tradition of salmon-colored dials in contemporary watchmaking, combined with the extreme visibility characteristic of professional orange diver dials, resulting in an energetic timepiece full of personality on the wrist.
• Flat Factory-Made Sapphire Crystal: Forget about daily wear and tear: sapphire offers virtually absolute resistance to accidental abrasions, accidental impacts, and scratches from sand or metal.
• SUS316L Surgical/Marine-Grade Stainless Steel Construction: A higher molybdenum alloy effectively protects the case and bracelet from rust caused by saltwater and sweat, preventing pitting corrosion and being gentle on the skin.
• Genuine 200-Meter Diver Water Resistance: A screw-down crown protected by angular guards and a pressure-screwed-on case back provide comprehensive water resistance of 20 ATM for any intense aquatic activity.
• JIS Type 1 Magnetic Shielding: The movement is internally protected against everyday electromagnetic interference (laptops, smartphones, case closures, or aircraft cabin equipment), preventing unwanted magnetization.