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View picture in original size
Fig. 1

IWC 8531

Features
automatic
sweep second
date

Data
13''', Dm= 29.0mm
H= 6.4mm
21 jewels
f = 19800 A/h
power reserve 44h

Balance staff U2863

Stem W2269

Mainspring / battery
1.25 x 10.0 x 0.10mm

Hands
1.40 x 0.80mm

Comments about the data

Remarks
1958-1963, 55200
excenter winding mechanism
adjustment screws on balance spokes
Breguet hairspring
Reed's regulator

Example, year: signature; shock device
1962: 1654XXX, International Watch Co Swiss, C.853, Pat. Appl.; Incabloc
(IWC 853)

© J. zur Horst
CHRONOMETRIE ZUR HORST

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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