The AS 1525 is the base caliber, of which there exists also a larger version, the AS 1526.
The only difference between the two is the base plate, which measures 10 1/2 lignes here and 11 1/2 on the AS 1526.
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 an anular balance with two legs, which is shock protected by two Incabloc bearings. It still beats slowly with 18000 A/h and can be regulated at the hairspring key only.
For reducing height, the base plate is slanted on its outer edges and a part of the mainspring barrel is free.
In the lab
Timegrapher resultThe timegrapher results are pretty good, but in contrast to the AS 1526 in the archive, which uses a Glucydur balance, they are a bit less good.
|dial up||+2 s/d||300°||0.4ms|
|dial down||+-0 s/d||317°||0.2ms|
|crown right (12 up)||+2 s/d||272°||0.1ms|
|crown up (3 up)||-4 s/d||273°||0.1ms|
|crown left (6 up)||+11 s/d||273°||0.4ms|
|crown down (9 up)||+20 s/d||268°||0.6ms|
|Size:||10 1/2''' (measured: 23,0mm)|
|Number of jewels:||17|
Nickel 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 8|
|Mentioning in literature (years):||1963 - 1971|