AHS 53

 
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AHS 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 12 lignes.

base plate

base 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 train

gear 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 train

Side 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 side

AHS 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.

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 result

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.

horizontal positions
dial up +110 s/d 328° 1.5ms
dial down +30 s/d 245° 0.4ms
vertical positions
crown right (12 up) -61 s/d 210° 1.4ms
crown up (3 up) +30 s/d 238° 0.5ms
crown left (6 up) +200 s/d 213° 0.2ms
crown down (9 up) +120 s/d 213° 0.4ms

Technical data

Manufacturer:AHS
Caliber:53
Escapement:Pin lever
Balance types: Nickel anular balance
Shock protection(s): none
Balance bearing / direction hairspring:Bridge
Moveable stud:yes
Adjust mechanism:Hairspring key
Construction:
  • lever, escape wheel, seconds wheel, third wheel, center minute wheel, mainspring barrel
Construction type:pillar construction
Winding mechanism:rocking bar winding system
Setting lever spring:3 hole(s)
Functions:hour, minute
A/h:18000
Size:10 1/2''' (measured: 23,5mm)
Inventory number:17012

Usage gallery

AHS gents watch (11/1980)

AHS gents watch (11/1980)

Domina ladies' watch

Domina ladies' watch

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