Until the 1980s, Longines was famous for their sometimes fantastic inhouse movements, unfortunately, the quartz crisis led to Longines, in the meantime part of the Swatch Group, no longer producing own movements but only using movements from the Swatch Group, like many other brands of the Swatch Group do.
The Longines 9.35 shown here was made more than 100 years ago. It is a good quality ladies’ watch movement with about 20mm diameter.
On this movement, all important bearings contain rubies; escape and seconds wheel are beared under their own cocks.
It is pretty odd, that the ratchet is located on the inner side of the mainspring barrel bridge. Since the movement came in bad condition into the archive, it is not sure, that the shown construction of the ratchet is correct.
The gear train is standard with a directly driven center minute wheel, followed by third wheel, seconds wheel (which could carry a decentral seconds hand at 9 o’clock, but not on the specimen shown here) and finally the steel escape wheel.
The Longines 9.35 uses a swiss pallet lever escapement.
The Guillaume screw balance (with a slotted balance wheel for temperature compensation) is not yet shock protected. A Breguet hairspring with a specially curved end curve should ensure better precision and a long regulator arm with scale is used to adjust the beating rate of 18000 A/h.
Technically, this was top of the line at that time!
On the dial side, you see the yoke keyless works, which uses two springs. The setting lever, which points against a pin on the plate is a pleasure to see and shows, how well Longines movements were at that time.
With the serial number, you know, when the movement was made - the specimen shown here was produced in 1919.
|Number of jewels:||15|
bimetallic screw balance|
|Balance bearing / direction hairspring:||Clockwise|
|Adjust mechanism:||Long regulator arm|
|Construction type:||solid construction|
|Winding mechanism:||yoke winding system|
|Setting lever spring:||2 hole(s)|
|Functions:||hour, minute, decentral second|
|Size:||8 3/4''' (measured: 19,8mm)|