A digital wristwatch for your finger — practical and playful. Compact design, sophisticated look, and a touch of pure fun.
Creating a ring-sized version of the Casio watch’s complex form and functions was no easy feat. To make this possible, we needed to use advanced metal injection moulding (MIM) to recreate fine details with precision in stainless steel. The ring is then finished with gold-coloured ion-plating for a polished gleam.
The monocoque case and special glass adhesive technique ensure a tight seal for everyday water resistance, while still allowing the battery to be replaced. We downsized the standard watch module by a factor of 10 and paired it with a small button battery to create a fully functional 3-button digital watch that actually fits right on your finger.
Even at this small size, the watch features a 7-segment LCD that shows all the info you need — hours, minutes, and seconds, as well as date, dual time, and stopwatch. A soft, flashing light activates at your chosen time, offering a subtle and emotive glow.
The ring fits a size 22 finger (US 10.5, EU U) and comes with two size-adjusting spacers, in size 19 (19-mm inner diameter) and size 16 (18-mm inner diameter).
Basic Information
Case size (L× W× H)
25.2 × 19.5 × 6.2 mm
Weight
16 g
Case and bezel material
Stainless steel
Water resistance
Water Resistant
Power supply and battery life
Approx. battery life: 2 years on SR621SW
Exterior
Glass
Mineral Glass
Surface treatment
Gold ion plated case
Compatible band size
The ring has an inner diameter of 20 mm and a circumference of 62.8 mm, fitting a size 22 finger (US 10.5, EU U). Two size-adjusting spacers in size 19 (19-mm inner diameter) and 16 (18-mm inner diameter) are included.
Watch Features
World time
Dual time
Stopwatch
1/100-second stopwatch
Measuring capacity: 00'00''00~59'59''99
Alarm/hourly time signal
Time flash (daily and every hour on the hour)
* The Time Flash light may not be visible when ambient lighting is bright.
* Time Flash is intended for entertainment purposes.
Light
LED backlight
May not be visible in bright light.
Light colour
LED:White
Calendar
Auto-calendar (28 days for February)
Accuracy
Accuracy: ±30 seconds per month
Other features
12/24-hour format
Regular timekeeping:
Digital: Hour, minute, second, pm, month, date, day
