AHS 75

AHS 75 | 17jewels.info - The Movement Archive

AHS 75


In the 1960s, AHS launched their caliber series 70, in which the base caliber AHS 70 was extended with a date indication - the 10 1/2 ligne caliber AHS 75, shown here.

Also the AHS 75 is hallmarked as “AHS 70”, which makes its identification a little difficult.

AHS 75: base plate

base plate

We have a better pin ever movement here, where at least all important bearing contains rubies, often together with cap jewels.

AHS 75: gear train

gear train

The gear train of this pillar movement is classical: Mainspring barrel, center minute wheel, third wheel, seconds wheel and steel escape wheel.

The indirectly driven center second indication is driven by a second wheel on top of the third wheel axle. It center second pinion is beared under an own cock with a ruby, a good solution.

AHS 75: side view of the gear train

side view of the gear train

The anular balance is protected with a pair of (unfortunately missing on the specimen shown here) RUFA Antishock protections.

It beats contemporarily slow with 18000 A/h and can be regulated at the hairspring key only.

AHS 75: AHS 75: Dial side (incomplete)

AHS 75: Dial side (incomplete)

The ratchet of the AHS 75 is located on the dial side as well as the rocking bar keyless works. The ratchet consists only of a simple u-shaped spring, as you can see at 12 o’clock.

The calendar module is secured with three screws onto the dial side. Most probalby a calendar disc is used. Although is is missing on the specien shown here, it’s relative, the AHS 154, uses the same calender mechanism.

Technical data

Caliber base:AHS 70
Size:10 1/2''' (measured: 23,7mm)
Number of jewels:17
Escapement:Pin lever
Balance types: monometallic anular balance (two legs)
Shock protection(s): Rufa-Anti-Shock
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
Adjust mechanism:Hairspring key
  • lever
  • escape wheel, seconds wheel, third wheel, center minute wheel, mainspring barrel
  • center second pinion
Construction type:pillar construction
Winding mechanism:rocking bar winding system
Setting lever spring:4 hole(s)
  • SCI (indirect center seconds)
  • QG (date indication (aperture))
References: Flume: (K2 26), K3 75
Inventory number:21041
This movement is a kind donation from Mario to the movement archive. Thank you very much for your great support!

Caliber Family
AHS 70