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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Alpina 431 (Gruen 431)

Features
manual wind
sub second

Data
8.75 x 9.75''', Dm= 19.4 x 22.0mm
Do= 19.4 x 22.35mm
H= 4.05mm
F= 2.0mm
T= 2.4mm
15 jewels
f = 18000 A/h
power reserve 37h

Balance staff U1737

Stem W2075

Mainspring / battery
1.18 x 8.5 x 0.105 x 250mm
~Zf665, 1.20 x 8.5 x 0.095 x 265mm

Hands
1.22 x 0.66 / 0.16mm

Comments about the data

Remarks
1940-
Breguet hairspring
stem mechanism without setting-lever spring

Example, year: signature; shock device
ca. 1945: B 311163, GXC, Gruen Watch Co, Switzerland, Veri-Thin Patented, 17 Jewels - ›
(Gruen 435)

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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