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View picture in original size
Fig. 1

View picture in original size
Fig. 2

AM 491

stem wind and set
sub second

17''', Dm= 38.2mm
H= 5.5mm
15 jewels
f = 18000 A/h
power reserve 30h

Balance staff U964

Stem W1467

Mainspring / battery
Zf3553, 2.10 x 15.0 x 0.18 x 450mm

1.90 x 1.00 / 0.28mm

Comments about the data

open face calibre
differences not known between 490...499

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
ca. 1936: IX, Swiss Made, 15 Jewels - AM logo, Ebauches-SA logo from 1936 (TR in shield)
(AM 520, 16.25''', H= 3.95mm)

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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