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View picture in original size
Fig. 1

View picture in original size
Fig. 2

IWC 74

Features
stem wind and set
sub second

Data
17''', Dm= 37.4mm, Do= 38.0mm
H= 4.2mm
F= 0.5mm
T= 1.5mm
16 jewels
f = 18000 A/h
power reserve 30h

Balance staff U155

Stem W1477

Mainspring / battery
1.20 x 15.0 x 0.20mm

Hands
1.65 x 0.90 / 0.15mm

Comments about the data

Remarks
1913-1931, ~15000
hunter calibre
bimetallic screw balance with 4 adjustment screws
Breguet hairspring
patented big bearings for crown- and ratchet wheel
barrel with Geneva stopwork
details cf. IWC 52 19'''H5

Swiss Patent 31457:
crown- and ratchet wheel with top- and bottom part, kept together with three screws each
filed 05-11-1904, Fabrique d'Horlogerie de J. Rauschenbach (CH)

Swiss Patent 55231:
dial fitting after push-button principle
filed 03-28-1911, Uhrenfabrik von J. Rauschenbach (CH)

family/generations:
73: open face calibre
74: hunter calibre
77: open face calibre, covered winding gear
suffix A: details unknown

Example, year: signature; shock device
1926: 840266, IWC Probus Scafusia - IWC Probus Scafusia, +31457, +55231

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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