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.

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.

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.

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.

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.

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

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.

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

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.

Technical data