AM 617

AM 617AM 617

Description

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

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 worksgear 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 platemain 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 sideAM 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

ManufacturerAM
Caliber617
Number of jewels10
Escapementcylinder
BalanceNickel
Shock protection(s)none
Balance cock directionclockwise
Hairspring studfixed
Regulator typeLong regulator arm
Movement constructionCenter second pinion
Fourth wheel, Third wheel, Center wheel
Mainspring barrel
Construction typesolid construction
Bridge shapeGiraffe, neck up, 3 gears
Winding mechanismyoke
Setting lever spring3 holes
FunctionsHour, minute
Beats per hour18000
Size83/4''' (measured: 19,1 mm)'''
Image in Flume Werksucher 1947 97
AM 61710 Jewels, 83/4''' (measured: 19,1 mm)''', 18000 A/h,
Factsheet

 

Usage gallery

ZentRa ladies' watchZentRa ladies' watch

 

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

   
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