Seiko caliber 6138B is Japanese movement from 1970’s.
Functions: 3 register on the dial – 60 seconds, 30 minutes and 12 hours, pillar wheel, date and day indications – quickset.
This movement is used on two models – UFO and Bullhead.
Automatic movement with 21 or 23 jewels.
f = 21600 A/h
Power reserve: 45 hours
Diameter: 27.0 mm
Other links:
Seiko caliber 6138B watch parts
