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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Longines 19.75

stem wind and pin set
sub second

19''', Dm= 41.9mm, Do= 43.1mm
H= 6.6mm
F= 0.4mm
T= 2.4mm
15 jewels
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 or hunter calibre
bimetallic screw balance
Breguet hairspring

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
(open face)

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.

bidfun-db 21.3 © 02-08-15, mtr-Ranfft

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