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View picture in original size
Fig. 1

View picture in original size
Fig. 2

FHF 4, 18.5'''H4.3

stem wind and set
sub second

18.5''', Dm= 41.25mm, Do= 41.85mm
H= 4.3mm
F= 0.5mm
T= 1.9mm
15/16 jewels
f = 18000 A/h
power reserve 36h

Balance staff U1304

Stem W1572

Mainspring / battery
Zf3235, 1.70 x 16.0 x 0.19 x 480mm

1.80 x 0.95 / 0.28mm

Comments about the data

open face calibre
options: bimetallic screw balance, Breguet hairspring
These pocketwatch calibres were made with 18.5 und 19''', and the heights 4.2, 5.0, and 5.9mm.
There are various bridge layouts, two base plates with differing dial-feet positions, and two slightly differing setting-lever springs.
The assignment of such differences to the groups FHF 1 to 14 and the calibres FHF 1144, 2144, 2146, 4144, 4146 is just partially known. But comparing the according calibres gives an imagination.
FHF 1 to FHF 16 designate movement groups containing calibres of different dimensions; individual designations start with FHF 22.

Example, year: signature; shock device
ca. 1930: ZentRa 78 - 6 7786, FHF
(ZentRa 78, FHF 1, 18.5'''H4.3)

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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