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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Cortebert 474-II

stem wind and set
sub second

18''', Dm= 40.25mm, Do= 40.85mm
H= 5.45mm
F= 0.55mm
T= 2.3mm
15/16 jewels
f = 18000 A/h
power reserve 37h

Balance staff U251

Stem W1499

Mainspring / battery
Zf3495, 2.00 x 16.0 x 0.20 x 460mm

1.92 x 1.18 / 0.30mm

Comments about the data

open face calibre
setting lever between plates
This sticks out of the movement when setting, and mostly the movement can only be uncased with the crown in winding position.
bimetallic screw balance with 2 adjustment screws
Breguet hairspring
Reed's regulator
This movement family was obviously an experiment subject. Most registers ignore this, but Flume at least lists the variants I and II of the Cortebert 474 with differing setting bridges. As far as these variants are also noticed for other calibres, they are here listed accordingly with the suffixes I and II.

473: open face, separate escape-wheel cock
474: open face, common cock for all wheels
484, 486, 487, 495: like 473, 474, differing details not known
18''', different balance:
479: open face, common cock for all wheels
485: hunter, center-wheel bearing in barrel bridge
476: open face, separate escape-wheel cock
477: open face, common cock for all wheels

Example, year: signature; shock device
ca. 1910: JC, Calibre 474 Déposé - 12 4

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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