Seiko Caliber 6308A

Brand	Seiko
Caliber Number	6308, 6308A
Base Caliber	Seiko 6309A
Movement Type	Automatic
Lignes	12”’
Diameter	27mm
Height	5.2mm thick
Jewels	17
Vibrations Per Hour	21,600 bph
Power Reserve	47 hours
Lift Angle	54.5 degrees (needs confirmed)
Shock System	Diashock
Rotor	Ball bearing
Mainspring	401615
Balance Staff	311601
Hands	1.5mm x 0.90mm x 0.20mm
Hacking?	No
Manual Winding?	No
Winding Direction	Bi-directional (Magic Lever)
Functions	Hours, minutes, central seconds, quickset date at 3:00
Country of Manufacture	Japan
Known Models	6308 (add more in the comments below…)

The Seiko caliber 6308A is a vintage automatic workhorse movement from the 1980’s and as far back as 1976.

6308A VS 6309A:

The caliber 6308A is based on the Seiko caliber 6309A. The main difference between these two movements is that the 6309A has a day/date complication at 3:00, whereas the 6308A only has a date at 3:00.

Additional Resources: