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Fig. 1

View picture in original size
Fig. 2

Seiko 6309A

no manual wind
sweep second
day: quickset, 2 languages
date: quickset

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

1.50 x 0.90 x 0.20mm

Comments about the data

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

manual wind:
63A: 17 jewels
6310A: Railroad Watch, 21 jewels
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

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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