AS 340

AS 340 | - The Movement Archive

AS 340


The 10 1/2 ligne windup movement AS 340, made in the 1920s was part of the 302 caliber series, which came in about two dozen different designs, all of which differed only in the shape of the bridges and in details like the setting lever.

AS 340: base plate

base plate

With 15 jewels, which were also neatly set, this movement belonged among the better lever movements that were available at the time.

On the specimen shown here, most of the jewels are only slightly ping, and the lever pallets are even transparent.

AS 340: gear train

gear train

The gear train also pleases with its well made execution. Its design is classic, with a directly driven, central minute wheel, third wheel, fourth wheel at 6 o’clock and steel escape wheel.

AS 340: side view of the gear train

side view of the gear train

The AS 340 uses a monometallic, two-leg screw balance used, which of course is not yet shock-protected.

In order to give her an even higher-quality impression, the balance wheel has got two halfway cluouts, so that one can to think at a first glance that you are looking at a bimetallic balance wheel.

It beats with 18000 A/h, which can be adjusted by a long regulator arm, and it regulates a classic swiss pallet lever escapement.

AS 340: AS 340: Dial side

AS 340: Dial side

Nice to see is the old AS hallmark at 7 o’clock, a clear indication of the 1920s as production decade.

At 3 o’clock you can see the yoke winding mechanism, which was quite modern at the time.

Another oddity is the filigree setting lever spring and recessed spring for the winding system, at position 4 o’clock.

Technical data

Caliber base:AS 302
Size:10 1/2''' (measured: 23,5mm)
Number of jewels:15
Escapement:Pallet lever
Balance types: monometallic screw balance (two legs)
Shock protection(s): none
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
  • lever
  • escape wheel
  • seconds wheel, third wheel, center minute wheel
  • mainspring barrel
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:1 hole(s)
References: Ebauches: 1928
Feilner: 4 176
Flume: 1947 25
Jacob: 17 11074
Inventory number:22052

Usage gallery

AS 340: anoymous gents watch (case missing)

anoymous gents watch (case missing)

AS 340: Rewco gents watch

Rewco gents watch

These movements are kind donations from Rolf and Horst Kull. Thank you for your great support of the movement archive!