The Arogno 151 is a relatively rate 10 1/2 ligne manual wind movement of fair quality from Switzerland.
Besides the indication of hours and minutes, it also has got a decentral seconds hand at 6 o'clock.
It has got the classical gear train with directly driven center minute wheel.
The two leg screw balance is not shock protected and beats contemporarily slow with 1800 A/h. It regulates a classical swiss pallet lever movement.
The setting lever spring, which is broken on the specimen shown here, has got a typical shape. You also see very well the yoke winding system of this movement.
In the lab
The specimen shown here was only slightly gummed and hence only got a fast cleaning and a simple service.
On the timegrapher
For a 60year old movement, which did not get a professional service, the rates on the timegrapher are OK.
It's noteable, that the vertical rates differ quite much and the amplitude is a bit lower, but on daily wear, those rates will more or less egalize each other. If the large beat error is corrected, the rates would be much better, but since that movement doesn't have a moveable hairspring stud, such a regulation can only be made by a professional watchmaker.