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View picture in original size
Fig. 1

View picture in original size
Fig. 2

AS 437

manual wind

9''', Dm= 20.3mm
8 jewels
f = 18000 A/h

Balance staff Cyl 0.68 x 3.24 x 0.73mm

Stem W982

Mainspring / battery
Zf831, 1.30 x 7.0 x 0.08 x 220mm

1.20 x 0.70mm

Comments about the data

cylinder escapement
unusual: crown mechanism with rocker bar, but ratchet on back side
unknown whether the completely functionless crown wheel is standard
just minor differences between 278, 437

Example, year: signature; shock device
1936: - AS, Ebauches-SA logo from 1936 (TR in shield)

© M. Lorenz

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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