AS 1201

AS 1201 | - The Movement Archive

AS 1201


In the late 1940ies, AS launched the twin movements AS 1200 (10 1/2 lignes) and the 11 1/2 ligne AS 1201, described here.

As usual with AS, it’s a very well made manual wind movement, here with decentral seconds indication at “6 o’clock”, on which the escapement wheel is beared under the gear train bridge, but due to a cutout on that bridge, you should have the impression, that an own cock was used for the escapement wheel.

Technically-wise there’s no advance, but it should remind of a good and expensive pocket watch movement.

AS 1201: base plate

base plate

On this movement, all bearings, except of the mainspring barrel and on the dial side of the minute wheel and ruby-equipped, the escapement wheel even with a cap jewel on the movement side. This leads of a total of 17 jewels.

AS 1201: gear train

gear train

We have a classical gear train with fourth wheel at 6 o’clock and directly driven minute wheel.

AS 1201: side view of the gear train

side view of the gear train

The screw balance of the contemporarily slow beating (18000 A/H) movements is beared in two Incabloc shock protection bearings and regulates a swiss pallet lever movement.

AS 1201: AS 1201 dial side

AS 1201 dial side

The bevelled shape of the base plate allows curved dials and hence flat cases.

On the dial side, you see the yoke winding system as well as the Incabloc bearing for the balance. At 6 o’clock there’s the prolonged axle of the fourth wheel, which will carry the small and decentral second hand.

In the lab

The movement came without case and in good condition on the lab. The rates were pretty high positive and the amplitude was rather low. Nevertheless, no full service was made, only reoiling (except the balance cock) and adjustements, so that the movement shows again good results on the timegrapher.

Timegrapher result

horizontal positions
dial up +90 s/d 220° 2.1ms
dial down +4 s/d 317° 1.3ms
vertical positions
crown right (12 up) +29 s/d 228° 2.0ms
crown up (3 up) +18 s/d 249° 1.6ms
crown left (6 up) +30 s/d 255° 2.0ms
crown down (9 up) +48 s/d 235° 2.4ms

Technical data

Size:11 1/2''' (measured: 25,6mm)
lift angle:52°
Number of jewels:17
Escapement:Pallet lever
Balance types: Nickel screw balance
Shock protection(s): Incabloc
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
Adjust mechanism:Hairspring key
  • lever
  • escape wheel, seconds wheel, third wheel, center minute wheel
  • mainspring barrel
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:3 hole(s)
  • s (decentral seconds)
References: Flume: 1952 6
Inventory number:15018

Usage gallery

AS 1201: Erman gents watch  (without case)

Erman gents watch (without case)