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View picture in original size
Fig. 1

View picture in original size
Fig. 2

Durowe 540

Features
manual wind
sweep second

Data
11.5''', Dm= 25.6mm, Do= 26.0mm
H= 3.65mm
F= 1.0mm
T= 1.9mm
17/21 jewels
f = 18000 A/h
power reserve 40h

Balance staff U2243

Stem W2404 / W2875
thread 1.1mm/0.9mm

Mainspring / battery
Zf675, 1.20 x 9.5 x 0.10 x 315mm

Hands
1.30 x 0.80 x 0.22mm

Comments about the data

Remarks
1956-
different mainsprings in 540, 542

family/generations:
10.5''':
440: manual wind
443: manual wind, small date
445: manual wind, modified bridge shapes
10.5''', balance like successor family 450ff:
441: manual wind
446: manual wind, modified bridge shapes
11.5''':
540, 542: manual wind
570: automatic
580: automatic, small date
585: manual wind, normal date
590: automatic, normal date
suffix -1: ring balance, no regulator pointer

Example, year: signature; shock device
ca. 1960: Laco, 17 Jewels - 2; Duro-Swing
(Durowe 542)

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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