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AHS 53

 

AHS 53AHS 53

Description

The AHS 53 shown here is from the last generation of pin lever movements from Germany. It was produced around 1980 and was the base model, showing only hours and minutes.

It as got the typical diameter for those kind of movements, 10 1/2 lignes.

base platebase plate

The base plate (hallmarked! This was pretty unusual for AHS) shows, that this movement is a very cost efficient pillar construction. There are no ruby bearings and the windig part uses a large plastic cage.

gear traingear train

We see the typical gear train for this kind of movements: Directly driven center minute, second wheel, fourth wheel, escapement wheel. With a longer pivot, the fourth wheel could carry a decentral second hand. Here it has got the short pivot.

Side view of the gear trainSide view of the gear train

The speciality of this movement is the balance staff, since it doesn't use a balance cock here, but the balance wheel is beared below a bridge. This allows easier height-adjustment of the non shock protected balance wheel in its metal bearings. The anular balance beats with 18000 A/h and regulates a conventional pin lever movement.

AHS 53: Dial sideAHS 53: Dial side

There are no surprises on the dial side. The ratchet consists only one simple spring and we have a rocking bar winding system. At 9 o'clock you see the metal bearing of the balance wheel.

 

 

 

 Technical data

ManufacturerAHS
Caliber53
Number of jewels0
Escapementpin lever
BalanceNickel
Shock protection(s)none
Balance cock directioncentered (bridge)
Hairspring studmoveable
Regulator typeHairspring key
Movement constructionFork, Escapement wheel, Fourth wheel, Third wheel, Center wheel, Mainspring barrel
Construction typepillar construction
Winding mechanismRocking bar
Setting lever spring3 holes
FunctionsHour, minute
Beats per hour18000
Size101/2''' (measured: 23,5 mm)
Inventory ID 17012
AHS 53AHSAHS5310 1/2'''AHS 530 Jewels, 10 1/2''', 18000 A/h
Factsheet

 

 

 

In the lab

The specimen shown here came in used but working condition into the lab and thus was only slightly oiled and adjusted.

 

 

 

Timegrapher output

vertical positions
positiondeviationbeat error amplitude
12 up  -61 seconds/day  1.4 ms  210 °
3 up  +30 seconds/day  0.5 ms  238 °
6 up  +200 seconds/day  0.2 ms  213 °
9 up  +120 seconds/day  0.4 ms  213 °
horizontal positions
positiondeviationbeat error amplitude
dial down  +30 seconds/day  0.4 ms  245 °
dial oben  +110 seconds/day  1.5 ms  328 °
timegrapher measurings

The timegrapher results were kind of expected and are typical for a simple, used pin lever movement. There are large amplitude difference between hanging and flat positions and the differences of the rates are pretty high. The simple balance wheel bearing is probably the cause for it.

 

 

 

 

Usage gallery

AHS gents watch (11/1980)AHS gents watch (11/1980)Domina ladies' watchDomina ladies' watch

 

 

 

The "Domina" watch with movement in working condition is a kind donation of Günter G. Thank you very much!