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11.5''', Dm= 25.6mm
f = 18000 A/h
power reserve 40h
Balance staff U1420
Mainspring / battery
Zf1319/1, 1.60 x 9.5 x 0.10 x 315mm
1.30 x 0.90 x 0.20mm
Comments about the data
like 251, but bigger base plate
signature under dial also 25
option: Fonto regulator with mobile stud carrier and adjustustable regulator pin-width
Example, year: signature; shock device
ca. 1950: Arsa, Pat., Swiss, 17 Jewels; Incabloc
(FHF 25, 10.5''')
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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