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stem wind and pin set
18''', Dm= 39.75mm, Do= 40.65mm
f = 18000 A/h
power reserve 38h
Balance staff U1048
Mainspring / battery
2.50 x 15.5 x 0.19mm
1.78 x 0.55 / 0.26mm
Comments about the data
open face calibre
bimetallic screw balance
ratchet on dial side, click-unlocking from rear side by marked screw head, crown mechanism with rocker bar
straight long lever (ligne angulaire) with counterweight and hidden pallets (Fig.3)
Swiss Patent 16831:
filed 11-21-1931, Charles Brisebard, Besancon (FR)
two-section regulator for coarse and fine adjustment (Fig.4)
18.49: open face
Example, year: signature; shock device
1908: Longines, +16831 - 2030522
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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