AM 617

 
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AM 617

Description

The AM 617 is a relatively modern constructed and well made cylinder movement of the late time of movements with cylinder escapement.

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With 10 jewels, a cylinder movement has got its full equipment with rubies - so on this movement, too. In theory, you could add two additional jewels to the minute wheel, but until now, I’ve never seen such a cylinder movement.

gear works

gear works

Cylinder movements were build until the mid of last century. Compared to lever movements, they were cheaper and simpler, since they contained one less moving part - the lever . The disadvantage of there movements were, that the sharp teeth of the cylinder wheel always were in contact with the balance cylinder, thus breaking a little bit. On wear of these teeth and on magnetizing, it was soon stopped.

Besides this, cylinder movement were rather inprecise - a daily rate of one or two minutes per day was not unusual.

main plate

main plate

The AM 617 is one of the few small cylinder movements, which already used a yoke winding system. This is remarkable, since it means, that a rather cheap movement got a rather expensive winding system.

In terms of quality, this is very positive!

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AM 617 dial side

AM 617 dial side

At position “9”, you see the T-shaped escapement module, which consists of the balance bearing on the dial side and the balance cock as a unit. This constructions allows a precise depthing setting of the balance cylinder into the cylinder wheel, which is required for reliable function.

At “1”, you can see the “Ebauches Trust” hallmark.

Technical data

Manufacturer:AM
Caliber:617
Number of jewels:10
Escapement:Cylinder
Balance types: Nickel anular balance
Shock protection(s): none
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
Construction:
  • center second pinion
  • seconds wheel, third wheel, center minute wheel
  • mainspring barrel
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:3 hole(s)
Functions:hour, minute
A/h:18000
Size:8 3/4''' (measured: 19,1mm)
Literature: Flume: 1947 97

Usage gallery

ZentRa ladies' watch

ZentRa ladies' watch

This movement was donated by Harald Hoeber and identified by Badener of the UhrForum. Thank you very much!

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