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View picture in original size
Fig. 1

Seiko 6308A

Features
automatic
no manual wind
sweep second
date: quickset

Data
12''', Dm= 27.0mm, Do= 27.4mm
H= 5.35mm
17 jewels
f = 21600 A/h
power reserve 47h

Balance staff Seiko 311601

Stem Seiko 354601

Mainspring / battery
Seiko 401615

Hands
1.50 x 0.90 x 0.20mm

Comments about the data

Remarks
1976-
ball-bearing rotor
sophisticated excenter self-winding mechanism with just one gear stage (details cf. Seiko 6139B)
no hairspring stud, hairspring clamped directly in terminal
many parts and casing dimensions from equivalent models of the 61XX family

family:
manual wind:
63A: 17 jewels
6310A: Railroad Watch, 21 jewels
automatic:
636: Seiko 5 Akutasu, details not known
639: export only, details not known
6308A: date, 17 jewels
6309A: day, date, 17 jewels
6319A: day, date, 21 jewels
6347A: date, moon phase, 23 jewels
6349A: day, date, 23 jewels

Example, year: signature; shock device
1984: Seiko, Japan, 17 Jewels; Diashock
(Seiko 6309A)

Not for Sale!
The movements presented in this caliber finder are not for sale. This is only a data sheet for identification and evaluation of the movement calibre, as well as for approximate dating.

bidfun-db 21.3 © 02-08-15, mtr-Ranfft


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