Femga 502

 
Femga 502

Femga 502

Description

Femga, from the french Annemasse, released in the late 1940ies or early 1950ies the caliber family 500, which the Femga 502 presented here belongs to.

It is a 10 12 ligne pallet lever movement with indirectly driven center second indication.

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gears and trains

gears and trains

The screw balance is not yet shock protected and beats with contemporarily slow 18000 alternations per hour. It controls a conventional pallet lever movement of swiss type.

side view of the gears

side view of the gears

The construction is a conventional one, with fourth wheel an “6 o’clock”, third wheel at “7:30” and the directly driven minute wheel in the center.

The third wheel carries a prolonged pinion on the movement side, on which the driving wheel for the central second gear is attached. The center second gear is ruby-beared under its own cock.

base plate

base plate

In total, this movement has got 17 jewels.

Femga 502 dial side view

Femga 502 dial side view

On the dial side, you can spot the engraved partial minute dial (required for regulating the movement) and the large Femga hallmark. The whole caliber familiy 500 carries the same hallmark “FEMGA 500”, the exact caliber number can be found in the books.

The Femga 502 has got a yoke winding system.

In the lab

The specimen shown here was in good condition, but nevertheless got a full service with cleaning and oiling.

Timegrapher result

In the horizontal positions, the Femga 502 showed extraordinary performance, on the vertical positions, it performed not really well with large deviation in total and big positional differences.
crown right (12 up)

crown right (12 up)

crown up (3 up)

crown up (3 up)

crown left (6 up)

crown left (6 up)

crown down (9 up)

crown down (9 up)

dial up

dial up

dial down

dial down


horizontal positions
dial up-1 s/d
dial down+-0 s/d
vertical positions
crown right (12 up)-42 s/d
crown up (3 up)-30 s/d
crown left (6 up)-35 s/d
crown down (9 up)-60 s/d
Timegrapher output

Technical data

Manufacturer:Femga
Caliber:502
Number of jewels:17
Escapement:Pallet lever
Balance types: Nickel screw balance
Shock protection(s): none
Balance bearing / direction hairspring:Clockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel, center minute wheel
  • mainspring barrel
  • center second pinion
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:2 hole(s)
Features:SCI
Functions:hour, minute, second
A/h:18000
Size:10 1/2''' (measured: 23,2mm)
Literature: Flume: 1952 5

Usage gallery

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