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stem wind and set
19.5''', Dm= 43.9mm
f = 18000 A/h
power reserve 32h
Balance staff U1136
2.10 x 1.10 / 0.22mm
Comments about the data
open face calibre (also made as hunter)
bimetallic screw balance with 4 adjustment screws, Breguet hairspring
cam disc regulator
negative stem mechanism for US market
Swiss Patent 27541:
design of the regulator
filed 01-19-1903, Hermann Roost, St-Imier (CH)
The official designation is 20.5'''NVI; thus it surely was produced with different plate sizes. Since the Zenith records gave no information about the actual sizes, the calibre is listed here also as 19.5'''.
Example, year: signature; shock device
1912: 1781908, Zenith, +27541 - 1908
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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