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View picture in original size
Fig. 1

View picture in original size
Fig. 2

View picture in original size
Fig. 3

Invar 19'''

stem wind and set
sub second

18.75''', Dm= 42.1mm, Do= 42.75mm
H= 6.0mm
(winding gear +0.2mm)
F= 0.7mm
T= 2.3mm
15/17 jewels
f = 18000 A/h
power-reserve 39h

Balance staff Ronda 1548

1.75 x 1.05 / 0.25mm

Comments about the data

hunter or open face calibre
bimetallic screw balance with 4 adjustment screws
Breguet hairspring with terminal curve after Philipps, optimized for a wide adjustment range (Fig.3)
vertically acting setting-lever spring (blade spring with low break risk)
Mobile setting wheels (mounted on the yoke) prevent that the hands are moved when the crown is pushed in.

19''': with setting-lever spring
19''' new: without setting-lever spring

Example, year: signature; shock device
ca. 1910: 201864, Invar - 201864
(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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