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Fig. 3

Zenith 19.5'''

stem wind and set
sub second

19.5''', Dm= 43.9mm
H= 7.6mm
15 jewels
f = 18000 A/h
power reserve 32h

Balance staff U1136

Stem W1651

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.

bidfun-db 21.3 © 02-08-15, mtr-Ranfft

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