AS is normally a safe bet, when you look for higher quality movements. Normally… Because the AS 1237 / 38 is not only an entry level movement, but also cannot be identified to a single number only.
The specimen shown here was made for export into the USA and so got only seven jewels.
Since the seven jewels spread out on four jewels for the balance wheel bearing, one for the ellipse of the balance and the remaining two for the pallets, are all other bearings only equipped with metal bushings. However, they are not just drilled, but pressed into the plates and bridges, just like jewel bearings.
The gear train is, as usual on AS movements, made in good quality. It’s a contemporary construction with directly driven center minute wheel, followed by third wheel, seconds wheel at 6 o’clock (used for a decentral seconds indication on the dial side) and a fine executed steel escape wheel.
The two leg screw balance is not yet shock protected. Here precise beating frequency is adjusted with a long regulator arm.
The gear train bridge reveals the, compared with other AS movements, simple construction: Below here, not only all gears are beared, but also parts of the winding system. On top of it, a cap plate is screwed, which bears the mainspring barrel.
On the dial side, there’s a rocking bar winding system, which is pretty unusual for AS. Nevertheless, it is very well executed with a real click pawl and spring.
|Number of jewels:||7|
Nickel screw balance|
|Balance bearing / direction hairspring:||Clockwise|
|Adjust mechanism:||Long regulator arm|
|Construction type:||pillar construction|
|Winding mechanism:||rocking bar winding system|
|Setting lever spring:||4 hole(s)|
|Functions:||hour, minute, second|
|Size:||10 1/2''' (measured: 23,1mm)|
Flume: (1949 I 84)|