This site uses cookies for monitoring purposes. If you continue using this site, you accept this cookie policy.

Arogno 151

 

 Arogno 151Arogno 151

 Description

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.

gear traingear train

It has got the classical gear train with directly driven center minute wheel.

side view of the gear trainside view of the gear train

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.

Arogno 151 dial sideArogno 151 dial side

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.

 

 

 

Technical data

ManufacturerArogno
Caliber151
Number of jewels15
EscapementAnchor with pallets
BalanceNickel screw balance
Shock protection(s)none
Balance cock directionclockwise
Hairspring studfixed
Regulator typeLong regulator arm
Movement constructionFork
Escapement wheel, Fourth wheel, Third wheel, Center wheel
Mainspring barrel
Construction typesolid construction
Winding mechanismyoke
Setting lever spring2 holes
Featuress
FunctionsHour, minute, small second
Beats per hour18000
Life angle49°
Size101/2''' (measured: 23,2 mm)
Image in Flume Werksucher 1949 I 43
Inventory ID 16021
Arogno 151ArognoArogno15110 1/2'''Arogno 15115 Jewels, 10 1/2''', 18000 A/h, s
Factsheet

 

 

 

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

vertical positions
positiondeviationbeat error amplitude
12 up  -115 seconds/day  7.7 ms  174 °
3 up  +15 seconds/day  7.8 ms  170 °
6 up  +115 seconds/day  7.2 ms  174 °
9 up  -138 seconds/day  6.8 ms  179 °
horizontal positions
positiondeviationbeat error amplitude
dial down  +23 seconds/day  5.9 ms  213 °
dial oben  +22 seconds/day  6.4 ms  203 °
timegrapher measurings

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.

 

 

 

Usage gallery

Tramont gents watchTramont gents watch