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stem wind and pin set
19''', Dm= 41.9mm, Do= 43.1mm
f = 18000 A/h
Balance staff Ronda 234 / 1613
(pivot 0.11 / 0.13mm)
1.80 x 1.00 / 0.26mm
Comments about the data
open face calibre
bimetallic screw balance
Swiss Patent 16831:
filed 11-21-1931, Charles Brisebard, Besancon (FR)
two-section regulator for coarse and fine adjustment
Example, year: signature; shock device
1902: Longines, +16831 - 1258178
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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