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8.75 x 12''', Dm= 19.35 x 26.3mm
f = 18000 A/h
power reserve 45h
Balance staff U1704
Mainspring / battery
Zf873, 1.30 x 10.0 x 0.11 x 320mm
1.50 x 0.70 / 0.20mm
Comments about the data
straight lever (ligne angulaire)
differences not known between 490, 490A
Swiss Patent 158882:
filed 11-21-1931, Straub & Co. Fabriques des Montres Alpina (CH)
lever for secure fixing of the stem in the movement, as long as it is in the case shell (lever in Fig.3)
Example, year: signature; shock device
ca. 1935: 224282, Alpina 490A - Pat.+158882 (under barrel bridge)
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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