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View picture in original size
Fig. 1

View picture in original size
Fig. 2

AM 520

stem wind and set
sub second

16.25''' (16...17'''), Dm= 36.4mm, Do= 36.8mm
H= 3.95mm
F= 0.5mm
T= 1.9mm
15/17 jewels
f = 18000 A/h
power reserve 30h

Balance staff U1296

Stem W1466

Mainspring / battery
Zf2972, 1.45 x 15.0 x 0.18 x 450mm

1.90 x 1.00 / 0.28mm

Comments about the data

open face calibre
option: bimetallic screw balance (in example uncut)
differences not known between 520...529

480...489: H= 4.5mm
490...499: H= 5.5mm
500...509: H= 5.85mm
520...529: H= 3.95mm
540...549: H= 3.45mm

Example, year: signature; shock device
1936: IX, Swiss Made, 15 Jewels - AM logo, Ebauches-SA logo from 1936 (TR in shield)

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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