The AHS is a simple made pallet lever movement, on which a selfwinding
module was added, which was used under the term "Robot-Automatic" on other
movements.
Unlike most other AHS movement, the AHS 154 is a true lever movement and hence
pretty rare.
movement view without rotor
The selfwinding mechanism consists of an excenter changer with
ruby wheels.
selfwinding mechanism
As you can see, the selfwindig mechanism is pretty crude and the oscillating weight
is just axle beared and will scratch on the movement or on the back sooner or later.
selfwinding mechanism, flipped over
selfwinding mechanism, driving gear">
The click moves the winding wheel and decouples it on hand winding. This leads to
abrasion, which can be seen on the dark spots at the tip of the click and on the
gear.
movement view without selfwinding mechanism
When you see the movement without selfwinding mechanism, you would hardly think, that there's
something missing. The only indication is the ratchet wheel at "11", which has got no
connection to a crown wheel, but is driven by the selfwinding mechanism and by the
barrel wheel on the dial side.
Such a construction with (rocking bar) winding mechanism on the dial side and
click mechanism on the movement side is an odd rarity.
The complete wheel works are located under one 3/4 bridge. This makes a service pretty hard,
but is a very cheap construction.
movement view without escapement
The AHS 154 uses a screw balance, which is beared in two Rufarex shock
protections. The hairspring is fix connected to the balance cock and is adjusted in its effective length
by a short regulator arm with scale.
gears construction
The gear construction is classic, but not outdated, since here, they used already a construction
with concentric minute wheel and center second pinion. The minute wheel is located under an own
cock.
center second drive
The indirectly driven center second consits of a pinion, whose number of theeth (8) is the same
as the number of teeth of the fourth wheel gear (at "6"). Since both work with the third wheel, they
have got the same number of rotations per minute (1).
The center second pinion is "braked" by tiny spring to avoid a jumpy center second hand.
base plate with minute wheel
Of course, all bearings (except the minute wheel bearing) contain synthetic rubis, and additionally,
there are many cap jewels (on the dial side even for the lever) used. In sum, when you also count the
ruby wheels of the selfwindig mechanism, you get the number of 23 jewels.
This movement uses a cheap pillar construction with non-massive plates.
dial side without date mechanism
There's no technical neccessity for using ruby bearings on the mainspring barrel and for
using cap jewels for the lever bearing, but it helps increasing the number of jewels on the dial.
The AHS 154 uses a rocking bar winding system with the click mechanism located on the movement side.
date mechanism
The date mechanism is pretty simple and is an own unit, which is held by three screws on the
main plate. It has got no quickset feature and only drives a date disc. Because of that, the date indication
is located quite near the center of the dial.
dial side view
In the 50ies, tiny red date indicators were used quite often, but at the early sixties, this was
already out-of-fashion.
Technical data
Manufacturer
AHS
Caliber
154
Number of jewels
21
Escapement
Anchor with pallets
Balance
Nickel screw balance
Shock protection(s)
Rufarex
Balance cock direction
clockwise
Hairspring stud
fixed
Regulator type
Short regulator arm
Movement construction
Fork Escapement wheel, Fourth wheel, Third wheel, Center wheel, Mainspring barrel
Construction type
pillar construction
Bridge shape
full plate, inlet, 4 gears
Winding mechanism
Rocking bar
Setting lever spring
3 holes
Features
SCI,QG,AUT
Functions
Hour, minute, second, day, selfwinding
Beats per hour
18000
Size
101/2''' (measured: 23.3 mm)
Image in Flume Werksucher
1962 109
Factsheet
Test Results
The movement, when entered the lab, showed large abrasion, especially on the selfwindig mechanism.
It was dissolved, cleaned and oiled.
Timegrapher Protocol
On the timegrapher outout, you can see the bad condition of the movement. It was
extensively worn out and is beyond justation.
dial down
dial up
12 up
3 up
6 up
9 up
Measured Values
horizontal positions
dial down
-75 seconds/day
dial up
+30 seconds/day
vertical positions
12 up
-31 seconds/day
3 up
-... seconds/day
6 up
-.. seconds/day
9 up
-210 seconds/day
timegrapher measurings
Large deviations in all positions. In theory, it is possible to regulate them in a way,
that when worn, the medium deviation is pretty low. But this consumes a lot of time and is only
useful, when you intend to wear the watch.
