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View picture in original size
Fig. 1

View picture in original size
Fig. 2

AS 1257

manual wind

5.5 x 7''', Dm= 12.2 x 15.5mm
Do= 12.2 x 16.0mm
H= 3.0mm
F= 0.5mm
T= 1.5mm
17 jewels
f = 18000 A/h
power reserve 36h

Balance staff U1506

Stem W1184

Mainspring / battery
Zf905, 1.35 x 6.0 x 0.06 x 210mm

1.00 x 0.55mm

Comments about the data

differences not known between 1234, 1257, 1278, 1289

Example, year: signature; shock device
ca. 1945: Swiss Made, 17 Jewels
(AS 1234)

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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