Miyota Caliber 0S21 Quartz Watch Movement

Miyota Caliber 0S21

Miyota Caliber 0S21 Quartz Watch Movement

Manufacturer Miyota (Citizen)
Caliber Number 0S21 aka OS21
Type Quartz
Replaces Caliber Citizen 0510
Diameter 13.50”’ (30.80mm)
Battery Cell Number SR927W
Frequency 32,768Hz
Quartz Type Tuning fork type quartz crystal
Stem 065-453
Hand Sizes 120/80/18
Jewels 0
Functions Hours, minutes, central chronograph seconds, 60 minute counter, 24 hour hand, date
Country of Manufacture Japan
Known Models
REC, Philip Stein Active Chronograph

The Miyota caliber OS21 is a quartz watch movement with zero jewels. It is made in Japan.

Accuracy Rating

Miyota states the accuracy of this movement to be +/-20 seconds/month.

Additional Resources:

Watches with the Miyota 0S21