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|Alpina 641 (Venus 60-I)|
8.75''', Dm= 19.4mm, Do= 19.7mm
f = 18000 A/h
power reserve 34h
Balance staff U42
Mainspring / battery
Zf570, 1.15 x 7.5 x 0.09 x 220mm
1.20 x 0.60 / 0.12mm
Comments about the data
different bridge shapes (cf. Fig.1, 3)
bimetallic screw balance, just optionally cut
641 (Venus 60-I): -
617, 669 (Venus 60-II): setting-lever spring improved
A list from Alpina claims the Venus 60-III as base for the Alpina 669, but until now no according sample was noticed.
Example, year: signature; shock device
1-2) ca. 1920: Alpina, 641 - U
3) ca. 1925: Alpina, 641
© M. Schmelzer (Fig.3)
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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