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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Cortebert 540

stem wind and set
sub second

19''', Dm= 41.85mm, Do= 43.15mm
H= 5.6mm
F= 0.45mm
T= 2.3mm
15 jewels
f = 18000 A/h
power reserve 34h

Balance staff U972

Stem W1471

Mainspring / battery
Zf3576, 2.10 x 16.5 x 0.21 x 470mm

1.85 x 1.10 / 0.27mm

Comments about the data

open face calibre
Breguet hairspring
early samples with bimetallic screw balance
except varying bridge layouts no differences known between 526, 534, 540, 548

bigger barrel:
526, 534, 540, 548: open face, 19'''
527, 535, 541: hunter, 19'''
smaller barrel:
528, 536: open face, 19'''
529, 537: hunter, 19'''
530-532, 542: open face, 18'''
Suffix S: Chronometer

Example, year: signature; shock device
ca. 1920: 596, Tellus, Chronometer, 540S - 3001596
(Cortebert 540S)

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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