Introducing the stunning G-SHOCK inspired by the art of forging Japanese katana swords, from the flagship MR-G line of timepieces honoring artisanal craftwork.
Dedicated to traditional Japanese artisanal techniques handed down over centuries, this timepiece celebrates the traditions and aesthetics unique to Japanese swords with a design that incorporates the Juryoku-Maru: San, the katana commissioned by Casio for the MR-G line. The Japanese word for brilliant, the San in the sword’s name reflects the shine of the Japanese sword blade and its shell-studded scabbard.
The bezel, made of recrystallized hybrid titanium, evokes the distinctive edge pattern forged by master swordsmith Kamiyama Teruhira. The pattern is crafted with recrystallized layers of pure and Ti64 titanium that is cut, polished, and treated with a deep-layer hardening process to capture the pattern’s unique characteristics.
Subtle differences in materials and processing conditions, as well as the inscription of 燦, the Japanese character for San, hand-etched on the case back by the master himself, mean that each timepiece has its own utterly unique look, no two alike.
After recrystallization and deep-layer hardening processes, blue-grey AIP® is applied to the pure titanium center case to express the blue of the Juryoku-Maru: San sword.
The watch band features the aogai-nuri blue shell lacquer design by artist Nomura Mamoru, which adorns the Juryoku-Maru: San scabbard, achieved using a processing technology developed especially for this timepiece. Aogai-nuri refers to the mother-of-pearl inlay used so often in Japanese sword scabbards.
The titanium alloy DAT55G band is finished with a structural color technique that utilizes micro-level ultra-precision processing to create iridescent colors inspired by aogai-nuri blue shell lacquer. Three times harder than pure titanium, the DAT55G special alloy protects from scratches and wear, to keep the stunning mirror-finished surface and structural color flawless for years.
More than an homage to a beautiful tradition, this timepiece provides outstanding modern functionality, as well. Equipped with Bluetooth® for smartphone connectivity, the watch adjusts to radio-wave time signals for precision timekeeping and comes packed with handy functions powered by original Casio technology.
This very special MR-G celebrates both the traditional craftsmanship and modern technologies of Japan — all in a singular katana-inspired timepiece.
Kamiyama Teruhira
A young swordsmith of exceptional talent, Kamiyama leads the world of katana in modern Japan. Kamiyama’s pursuit of the strength and beauty of the Japanese sword mirrors the Casio vision for G-SHOCK, and it was for this reason that Casio commissioned the katana master craftsman to forge an original G-SHOCK sword, the Juryoku-Maru: San.
Nomura Mamoru
Third generation head of SAGARADEN NOMURA in Kyoto. Nomura entered the family business at the age of 20. Having studied urushi lacquer techniques, he performs every step of the process from painting to ornamentation (mother-of-pearl inlay and metallic powder maki-e) himself. In 2018, Nomura received the Japan Traditional Crafters Chairman’s Award for his lacquer natsume (matcha caddy).
*AIP® (arc ion plating) is a registered trademark of Kobe Steel, Ltd.
*DAT and DAT55G are registered trademarks of Daido Steel Co., Ltd.
Case size (L× W× H)
54.7 × 49.8 × 16.9 mm
Case and bezel material
Titanium
Band
Titanium alloy DAT55G band * DAT55G: DAT is a registered trademark of Daido Steel Co., Ltd. in Japan.
Solid Band
Tight-lock, 1-press, 3-fold Clasp
Construction
Magnetic Resistant
Shock Resistant
Water resistance
200-meter water resistance
Time adjustment
Bluetooth: Connects to a smartphone and automatically adjusts the time
Radio-controlled Watch; Multi band 6
Power supply and battery life
Tough Solar (Solar powered)
Smartphone Link feature
Mobile link (Automatic connection, wireless linking using Bluetooth®)
App connectivity feature
Auto time adjustment
Easy watch setting
Approximately 300 world time cities
Watch status display
Self check
Phone finder
Premium Production Line certificate
Glass
Sapphire crystal with anti-reflective coating
Surface treatment
Deep Layer Hardening + AIP®(Arc Ion Plating) case
Deep Layer Hardening + DLC bezel
DLC (Diamond-like carbon) coating band
Compatible band size
150 to 205 mm
World time
Dual time 27 time zones, Home city time swapping, auto summer time (DST) switching
Stopwatch
1-second stopwatch Measuring capacity: 23:59'59'' Measuring modes: Elapsed time
Timer
Countdown timer Measuring unit: 1 second Countdown range: 24 hours Countdown start time setting range: 1 minute to 24 hours (1-minute increments)
Alarm/hourly time signal
Daily alarm
Light
LED light (Super Illuminator) Afterglow
Calendar
Full auto-calendar (to year 2099)
Hand home position correction feature
The auto hand home position correction
Energy saving feature
Power Saving (hands stop to save power when the watch is left in the dark)
Run time
Approx. battery operating time: 5 months on rechargeable battery (operation period with normal use without exposure to light after full charge) 26 months on rechargeable battery (operation period when stored in total darkness with the power save function on after full charge)
Accuracy
Accuracy: ±15 seconds per month (with no signal calibration and mobile link function)
Other features
Regular timekeeping: Analog: 3 hands (hour, minute (hand moves every 5 seconds), second), 3 dials (dual time hour and minute, dual time 24 hour, day)
Date display
Day indicator
Time adjustment details
Time Calibration Signals Station name: DCF77 (Mainflingen, Germany) Frequency: 77.5 kHz Station name: MSF (Anthorn, England) Frequency: 60.0 kHz Station name: WWVB (Fort Collins, United States) Frequency: 60.0 kHz Station name: JJY (Fukushima, Fukuoka/Saga, Japan) Frequency: 40.0 kHz (Fukushima) / 60.0 kHz (Fukuoka/Saga) Station name: BPC (Shangqiu City, Henan Province, China) Frequency: 68.5 kHz
Time calibration signal reception Auto receive up to six* times a day (remaining auto receives canceled as soon as one is successful) *5 times a day for the Chinese calibration signal Manual receive The latest signal reception results