Casio to Release OCEANUS Watch with Bezel Treated with Edo Kiriko Cut Glass Technique

Blending Traditional Japanese Craftsmanship and Advanced Technology


Basel, March 21, 2018 — Casio Computer Co., Ltd., announced today the latest additions to the OCEANUS line of solar-powered radio-controlled watches designed to capture the essence of “Elegance and Technology.” The OCW-S4000S and OCW-S4000C feature bezels made using traditional Japanese Edo Kiriko cut glass techniques.

The new OCW-S4000S and OCW-S4000C blend traditional Japanese craftsmanship and advanced technology, inspired by contemporary Tokyo, a city of urban sophistication, history and tradition. Edo Kiriko is a traditional Japanese technique of cutting patterns into glass that dates back some 180 years. Edo is the original name of the city now called Tokyo.

The bezels of the OCW-S4000S and OCW-S4000C watches were treated using the Edo Kiriko cut glass technique, under the supervision of Toru Horiguchi. He is a third-generation master craftsperson who carries on the Horiguchi lineage of Edo Kiriko, while at the same time producing numerous innovative pieces. The bezels are made from hard sapphire crystal, which despite being difficult to work with due to its hardness, are expertly cut to achieve a stunning, refined brilliance. The sapphire crystal bezels are grown through repeated vapor deposition using different colors, to realize a beautiful deep blue color.

In terms of advanced technology, the watches are equipped with the Connected Engine module that links to a smartphone using Bluetooth®. The watches keep accurate time anywhere in the world using Connected Engine and radio wave time-calibration signals. A connected smartphone app also records and analyzes usage data from the watch in order to make possible a variety of features that enhance ease of use, such as reminding the user to charge the watch and warning about possible magnetic interference.

OCW-S4000S (limited to 150 watches worldwide)

The upper half of the bezel is cut in a traditional Japanese sensuji fine stripe pattern, while the lower half is multi-dimensionally cut using advanced technology, inspired by the fireworks displays in Tokyo. The inset dials are made of white mother of pearl.

OCW-S4000C (limited to 1,500 watches worldwide)

Sensuji fine stripes are irregularly arranged around the bezel, inspired by a picturesque Tokyo dawn with the morning rays reflecting on the water.

OCW-S4000S-1A sapphire crystal bezel
OCW-S4000C-1A sapphire crystal bezel


Water Resistance
10 bar
Radio Frequency
77.5 kHz (DCF77: Germany); 60 kHz (MSF: UK); 60 kHz (WWVB: USA); 40 kHz (JJY: Fukushima, Japan) / 60 kHz (JJY: Kyushu, Japan); 68.5 kHz (BPC: China)
Radio Wave Reception
Automatic reception up to six times a day (except for use in China: up to five times a day)
Communication Specifications
Communication Standard
Bluetooth® low energy*
Signal Range
Up to 2m (may differ depending on surrounding conditions)
1 second; measuring capacity: 23:59'59; measuring modes: elapsed time
Other Functions
Smartphone Link functions (world time: over 300 cities, automatic time adjustment, easy watch setting), Phone Finder, automatic hand correction (hour, minute and second hand), day and date display, full auto-calendar, battery level indicator, dual time (27 time zones, home time swapping)
Power Source
Tough Solar power system (solar-charging system)
Continuous Operation
About 18 months with the power-saving function* ON after full charge
  • Power-saving after a certain period in a dark location
Size of Case
48.3 × 43.3 × 11.4 mm
Total Weight
Approx. 90g
  • The Bluetooth® word mark and logos are registered trademarks owned by Bluetooth SIG, Inc. and any use of such marks by Casio Computer Co., Ltd. is under license.