This is another movement from the Adolf Michel S.A. under the roof of the Ebauches Trust organization. It is not marked any further, except the two letters “JF” below the balance. The Flume Werksucher from 1947 identifies it as AM 575.
It is a very simple cylinder movement with only one jewel on the balance cock. On the dial side, there is a rocking bar winding mechanism, and the ratchet wheel is only safe by a spring.
Nevertheless, watches with those kind of movements were worn for many years, you only shouldn’t pay too much attention to precision and reliability.
Technical data
Manufacturer
AM
Caliber
575
Number of jewels
1
Escapement
cylinder
Balance
Nickel
Shock protection(s)
none
Balance cock direction
clockwise
Hairspring stud
fixed
Regulator type
Long regulator arm
Movement construction
Escapement wheel
Fourth wheel, Third wheel, Center wheel, Mainspring barrel
The Ebauches Trust (also known as Ebauches S.A.) was from the 1920ies on a roof organization of several ebauche manufacturers, among them the Adolf Michel S.A. (AM) of Grenchen/Switzerland. They made that caliber 72, a form caliber in ladies’ size with a cylinder escapement.
With 6 jewels and a brass balance, it resembles the state of the art of pre WW II: Not ultimately precise, but pretty small and reliable.
Nevertheless, the high time of those tiny cylinder movements did not last very long, since equally small, but much more precise and reliable anchor movements took lover.
Technical data
Manufacturer
AM
Caliber
72
Number of jewels
6
Escapement
cylinder
Balance
Brass
Shock protection(s)
none
Balance cock direction
clockwise
Hairspring stud
fixed
Regulator type
Long regulator arm
Movement construction
Escapement wheel
Fourth wheel, Third wheel, Center wheel
Mainspring barrel
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