AS 1780

AS 1780 | - The Movement Archive

AS 1780


A rather late, but a little bit unusual constructed movement is this 8 3/4 ligne ladies` movement of AS. You can clearly see the rationalization influences of the sixties. Technically it resembles very well the state-of-the-art of that time: The large nickel ring balance beats with 21600A/h and in beared in Incabloc shock protection systems. The hairspring stud is moveable, the hairspring regulator has got no arm.

This movement uses an excentrical located minute wheel (on the movement side at “5”, on the dial side at “7”), which drives the hands indirectly. This kind of construction allows larger balances and mainsprings on smaller movements, which influence the daily rates and run time in a positive way.

Unfortunately, on the specimen shown here, the connection beween the minute wheel and the hands has become lose over the time, so that the hands are no longer driven.

AS 1780: AS 1780 dial side

AS 1780 dial side

Technical data

Size:8 3/4'''
lift angle:52°
Number of jewels:17
Escapement:Pallet lever
Balance types: Nickel anular balance
Shock protection(s): Incabloc
Balance bearing / direction hairspring:Clockwise
Moveable stud:yes
Adjust mechanism:Hairspring key
  • lever
  • escape wheel, seconds wheel, third wheel, large driving wheel
  • mainspring barrel
  • SCD (direct center seconds)
References: Flume: K3 11

Usage gallery

AS 1780: BWC ladies' watch

BWC ladies' watch