AS 1880

 
AS 1880

AS 1880

Description

The AS 1880 is a late, and for AS conditions unusally modern constructed windup movement from the late 1960s.

With its size of 11 1/2 lignes, it allowed a large mainspring barrel as well as a large balace, and so longer running times and higher precision.

base plate

base plate

The base plate shows, that all important bearings contain rubies, only the long bearing of the center seconds pinion on the dial-side bearing for the mainspring barrel consist of metal.

gear train

gear train

For AS conditions, the gear train is very modern, since the motion works is driven indirectly by the decentral minute wheel and an intermediate wheel

The mainspring barrel drives that minute wheel (located at 9 o’clock, seen from the movement side), followed by third wheel, center seconds wheel and steel escape wheel. This allows a very compact gear train.

side view of the gear train

side view of the gear train

As escapement, a swiss pallet lever escapement is used, which is regulated by a three-leg Glucydur balance. The balance beats with 21600 A/h, is adjusted at the hairspring key directly and runs in two Incabloc shock protection bearings.

mainspring barrel bearing

mainspring barrel bearing

It’s a bit odd, that the mainspring barrel of the AS 1880 is only ruby-beared on its upper side. Maybe it’s because the windup forces tend to harm the upper bearing otherwise.

empty dial side

empty dial side

The empty dial side shows, that the motion works is driven indirectly.

dial side with minute and intermediate wheel

dial side with minute and intermediate wheel

The motion works is driven by the decentral minute wheel (at three o’clock) with its slipping clutch, followed by an intermediate wheel. The cannon pinion and the minute wheel have 12 teeth, each. The reduction wheel inbetween also drives the hour wheel.

AS 1880: Dial side

AS 1880: Dial side

The rest of the dial side resembles good standard. Yoke keyless works and Incabloc shock protection are, what you’d expect from a good (AS-) movement.

In the lab

The specimen shown here came without surrounding case into the archive and got a simple service.

Timegrapher result

The rates are average, even a bit disappointing for the fact, that a Glucydur balance was used. Probably, that loose movement was not treated well.

horizontal positions
dial up -17 s/d 199° 0.3ms
dial down +3 s/d 198° 0.2ms
vertical positions
crown right (12 up) -11 s/d 190° 0.0ms
crown up (3 up) -33 s/d 194° 0.0ms
crown left (6 up) -33 s/d 189° 0.3ms
crown down (9 up) -3 s/d 187° 0.3ms

Technical data

Manufacturer:AS
Caliber:1880
Caliber base:AS 1746
Size:11 1/2''' (measured: 25,6mm)
Height:3,60mm
A/h:21600
Number of jewels:17
Escapement:Pallet lever
Balance types: Glucydur anular balance (three legs)
Shock protection(s): Incabloc
Balance bearing / direction hairspring:Clockwise
Moveable stud:yes
Adjust mechanism:Hairspring key
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel, decentral minute wheel
  • mainspring barrel
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:3 hole(s)
Features:
  • SCD (direct center seconds)
References: Flume: K3 42
Mentioning in literature (years): 1968 - 1971
Inventory number:21010
This movement is kind donation from Prof. Peter Schmid to the movement archive. Thank you very muchffor your kind support.