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5.75 x 8.5''', Dm= 12.8 x 19.2mm
Do= 12.8 x 19.5mm
f = 18000 A/h
Balance staff U2428
1.20 x 0.60mm
Comments about the data
bimetallic screw balance
differences not known between 831, 831A
Swiss Patent 158882:
lever for secure fixing of the stem in the movement, as long as it is in the case shell (cf. Alpina 490A)
filed 11-21-1931, Straub & Co. Fabriques des Montres Alpina (CH)
Example, year: signature; shock device
ca. 1940: Alpina 831A - 1818, Pat. +158882
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.
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