AS 1759
Description
The proven AS 1526 got an update with a higher beat rate (21600 A/h) and was then launched as AS 1759.
It has got a diameter of 11 1/2 lignes, but in fact, it is a 10 1/2 ligne movement, on which only the diameter of the base plate was enlarged.
base plate
The base plate shows, that all important bearings contain rubies. Only the minute wheel on the dial side, and the barrel on both sides are only meal beared, but since they rotate so slowly, that’s not a real disadvantage.
gear train
The AS 1759 uses the classical linear gear train with directly driven center minute wheel, third wheel, seconds wheel at 6 o’clock (here without prolonged axle for a seconds hand) and filigree steel escape wheel.
side view of the gear train
Of course, the AS 1759 uses a swiss pallet lever escapement. It is controlled by a golden toned, three leg Glucydur balance, which beats a little faster, with 21600 A/h.
The balance wheel is beared in two Incabloc shock protections and its precise frequency is adjusted at the hairspring key.
AS 1759: Dial side
The AS 1759 shows the familiar view on the dial side, with the Incabloc shock protection on the left and the yoke winding system on the right.
The base plate is slanted on the outer rim and cut out on the upper mainspring barrel area to reduce the height a few tenths of a millimeter.
In the lab
Timegrapher result
As expected, the rates are pretty well. The low amplitude values are an indicator, that this movement lacks a professional revision and will the perform even better.| horizontal positions | |||
|---|---|---|---|
| dial up | +14 s/d | 220° | 0.2ms |
| dial down | +10 s/d | 224° | 0.1ms |
| vertical positions | |||
| crown right (12 up) | +5 s/d | 189° | 0.2ms |
| crown up (3 up) | -4 s/d | 192° | 0.0ms |
| crown left (6 up) | -6 s/d | 187° | 0.4ms |
| crown down (9 up) | +10 s/d | 192° | 0.6ms |
Technical data
| Manufacturer: | AS |
| Caliber: | 1759 |
| Caliber base: | AS 1525 |
| Size: | 11 1/2''' (measured: 25,7mm) |
| Height: | 2,8mm |
| A/h: | 21600 |
| lift angle: | 52° |
| 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: |
|
| Construction type: | solid construction |
| Winding mechanism: | yoke winding system |
| Setting lever spring: | 3 hole(s) |
| References: |
Flume: K3 43 |
| Mentioning in literature (years): | 1971 |
| Inventory number: | 21020 |
Usage gallery
Stowa tails watch (case missing)