Lorsa 82

Lorsa 82 | 17jewels.info - The Movement Archive

Lorsa 82


The Lorsa 82, a windup movement with diameter of 8 3/4 lignes, made in France, dates from around the mid 1970s until the early 1980s and was one of the last tiny windup movements from France.

The contemporaneous offered tonneau shaped version of this movement was the Lorsa 81. Both are technically equivalent.

Lorsa 82: base plate

base plate

The execution of this movement is standard; of course all important bearings contain rubies.

Lorsa 82: gear train

gear train

The gear train follows the usual conventions for movements of this size: Mainspring barrel, directly driven center minute wheel, tiny third- and fourth wheel and finally a large steel escape wheel.

The additional space, compared with the tonneau version of the Lorsa 81 is not used at all.

Lorsa 82: side view of the gear train

side view of the gear train

Due to the limited space, the lower bearings of third- and seconds wheel are above the escape wheel.

Lorsa 82: movement w/o center seconds

movement w/o center seconds

The ratchet is the only different part compared with the Lorsa 81, because it consists of two parts, the click pawl and the a spring, which tends to fly away easily. Both are located below the ratchet wheel, and not easy to mount for a watchmaker.

Lorsa 82: gear train with center seconds

gear train with center seconds

The seconds wheel is beared on top by the center seconds bridge. The center seconds pinion is driven by a flying beared, just put onto an axle, transmission wheel, located at position 4 o’clock.

The drawback of this construction is, that as soon as the flying transmission wheel touches the bridge or the slightest part of dust is between this wheel and the bridge, so much friction is applied, that the amplitude goes down dramatically.

Lorsa 82: side view with center seconds

side view with center seconds

As escapement, a swiss pallet lever escapement is used.

It is controlled by the three-leg anular balance, which beats with 21600 A/h and is beared in two Antichoc-102- bearings.

The frequency can only be regulated directly at the hairspring key.

Lorsa 82: Lorsa 82: Dial side

Lorsa 82: Dial side

We have the expected view on the dial side, we see the woke winding system and we can see the two bearings of the third- and seconds wheel, which are above (seen from the movement side) the escape wheel.

Timegrapher result

On the timegrapher, it made almost the same good impression, as the Lorsa 81, and also here, with a little higher amplitude, it would have run in all positions within the chronometer specs, at least in five of the six positions

horizontal positions
dial up +5 s/d 264° 0.0ms
dial down -1 s/d 258° 0.2ms
vertical positions
crown right (12 up) +6 s/d 217° 0.1ms
crown up (3 up) -18 s/d 240° 0.3ms
crown left (6 up) -1 s/d 221° 0.4ms
crown down (9 up) -5 s/d 226° 0.3ms

Technical data

Size:8 3/4''' (measured: 19,3mm)
lift angle:52°
Number of jewels:17
Escapement:Pallet lever
Balance types: Nickel anular balance
Shock protection(s): Antichoc 102
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:yes
Adjust mechanism:Long regulator arm
  • lever
  • escape wheel, seconds wheel, third wheel, center minute wheel, mainspring barrel
  • transmission wheel, center second pinion
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:6 hole(s)
  • SCI (indirect center seconds)
References: Frankreich: 1976
Inventory number:23049

Usage gallery

Lorsa 82: Yema Sous Marine ladies' divers' watch

Yema Sous Marine ladies' divers' watch