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Fig. 1

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Fig. 2

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Fig. 3

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Fig. 4

AM 570

stem wind and set
sub second

17''', Dm= 38.1mm, Do= 38.4mm
H= 2.6mm
F= 0.4mm
T= 1.3mm
16 jewels
f = 18000 A/h
power-reserve 43h

Balance staff U965

Stem W1463

Mainspring / battery
Zf2777, 1.05 x 12.5 x 0.14 x 400mm

1.50 x 0.78 / 0.20mm

Comments about the data

open face calibre
bimetallic screw balance with 4 adjustment screws
Breguet hairspring

Swiss Patent 125517:
movement design especially for thin watches (Bild 3, 4):
filed 06-17-1927, A. Michel A.-G., Grenchen (CH)
Due to an intermediate wheel 1A between barrel 1 and center wheel 2 both don't overlap each other, and the movement height can be reduced accordingly. The lever bearing sidewise instead of underneath the balance allows a Breguet hairspring despite rather low profile.

Example, year: signature; shock device
1936: Marvin, Swiss, 16 Jewels 4 Adjs. - AM logo, Ebauches-SA logo from 1936 (TR in shield), Brevet +125517

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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