Lorsa 8FB

 
Lorsa 8FB

Lorsa 8FB

Description

The Lorsa 8FB is an only in details modified successor of the caliber Lorsa 8FA, so it’s a rather large form movement for ladies’ watches, which beats with 21600 A/h.

It probably dates from the late 1970ies or early 1980ies.

Lorsa 8FB dial side

Lorsa 8FB dial side

The only difference to the Lorsa 8FA. On the caliber 8FB, there’s an additional surrounding around the holes. Everything else remains the same.

Timegrapher result

The specimen shown here is NOS and unregulated, but might have sat for 30-40 years in the drawer. Nevertheless, the timegrapher rates are mostly very will, except on 9O, which cannot be explained:<br/>

horizontal positions
dial up +10 s/d 285° 1.9ms
dial down +4 s/d 274° 1.9ms
vertical positions
crown right (12 up) +1 s/d 240° 1.6ms
crown up (3 up) +20 s/d 230° 2.3ms
crown left (6 up) -18 s/d 231° 2.6ms
crown down (9 up) -85 s/d 239° 2.0ms

Technical data

Manufacturer:Lorsa
Caliber:8FB
Number of jewels:17
Escapement:Pallet lever
Balance types: Nickel anular balance
Shock protection(s): Rufa-Anti-Shock
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:yes
Adjust mechanism:Hairspring key
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel, center minute wheel
  • mainspring barrel
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:6 hole(s)
Functions:hour, minute
A/h:21600
Size:6 3/4 x 8''' (measured: 15,2 x 17,9mm)
Inventory number:17010

Usage gallery

Pallas Ormo ladies' watch

Pallas Ormo ladies' watch