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stem wind and set
18.75''', Dm= 42.1mm, Do= 42.75mm
(winding gear +0.2mm)
f = 18000 A/h
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
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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