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Fig. 1

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Fig. 2

Seiko 7S26A

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

12''', Dm= 27.0mm, Do= 27.4mm
H= 5.0mm
(ball bearing +0.15mm, dial spacer +0.25mm)
F= 1.65mm
T= 1.75mm
21 jewels
f = 21600 A/h
power reserve 43h

Balance staff Seiko 31020

Stem Seiko 351260

Mainspring / battery
Seiko 201024

1.50 x 0.90 x 0.20mm

Comments about the data

sophisticated excenter self-winding mechanism with just one gear stage (details cf. 7S26B)

first generation
7001A: -
7002A: Date
new date mechanism
7005A: date
7006A: day, date
7025A: date, small rotor
day setting by pushing crown
7009A: day, date, 17 jewels
7015A, 7017A: day, date, chronograph 60s
7016A: day, date, chronograph 60s, 30min, 12h
7018A,B: day, date, chronograph 60s, 30min, 23 jewels
7019A: day, date, 21 jewels
7039A: finer finished 7019A
quickset day and date
7S26A: day, date, 21 jewels
7S36A: day, date, 23 jewels
new regulator
7S26B: day, date, 21 jewels
7S36B: day, date, 23 jewels

Example, year: signature; shock device
1996: Seiko Time Corp. 7S26A, Japan, 21 Jewels - 160282S; Seiko

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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