The AS 1526 is the larger version of the AS 1525. The only difference between these two is the base plate, which measures 11 1/2 lignes here, while on the AS 1525, it measures only 10 1/2 lignes.
With a height of only 2.8mm, it builds very flat, which corresponded to what fashion demanded at the time.
This simple windup movement was quite popular in then 1960s and was honoured many times on the german quality check “Staatliche Qualitätsprüfung für die deutsche Armbanduhr”.
Of course, all important bearings contain rubies. Only the mainspring barrel and the base plate bearing of the minute wheel use metal bushings. To achieve the number of 17 jewels, the movement side escape wheel bearing uses a cap wheel.
The gear train is the classical one: The mainspring barrel drives the center minute wheel, followed by third wheel, seconds wheel and filigree steel escape wheel.
The specimen shown here uses a screw-less Glucydur balance with three legs, which was top notch at that time.
Of course, the balance wheel is shock protected in two Incabloc bearings. It beats slowly with 18000 A/h can can be regulated only directly at the hairspring key, which makes the adjustment a bit difficult.
In the lab
Timegrapher resultAlthough the regulation was quite tricky because of the lacking regulator arm, the quite constant results on the timegrapher show the high quality of this movement.
|dial up||+18 s/d||252°||0.2ms|
|dial down||+17 s/d||264°||0.0ms|
|crown right (12 up)||+16 s/d||217°||0.1ms|
|crown up (3 up)||+-0 s/d||232°||0.3ms|
|crown left (6 up)||+-0 s/d||218°||0.1ms|
|crown down (9 up)||+17 s/d||219°||0.3ms|
|Caliber base:||AS 1525|
|Size:||11 1/2''' (measured: 25,2mm)|
|Number of jewels:||17|
Glucydur anular balance (three legs)|
|Balance bearing / direction hairspring:||Clockwise|
|Adjust mechanism:||Hairspring key|
|Construction type:||solid construction|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||3 hole(s)|
Flume: 1962 9|
|Mentioning in literature (years):||1963 - 1970|