Watch Movement Handwinding mechanical Sonceboz ES 55 NOS Swiss made Voumard #3

Sonceboz ES 55?
(not sure, it could also be ES 54)

Scope of delivery: 1x Sonceboz ES 55 (ES54)

Hand-winding movement

Diameter: approx. 27.0 mm (12“`)

Almost impossible to find as a replacement movement

New Old Stock, working well,

Height: 4.9 mm (from bottom to the top of the date dial guard)

Shock protected

Pin lever

17 jewels, 21’600 A/h, from the 70s

It comes in the original plastic box

Some useful information from the web (from the ranfft website),

but it has not been checked for correctness:
Dm = 26.6 mm, Do = 27.0 mm
F = 0.65 mm
T = 1.9 mm

Do outer diameter, thus the largest. Most movements have a flange slightly larger than Dm,

to rest on the case band or mounting frame.

Dm mounting diameter. With this diameter the movement fits into the aperture of the case or mounting frame
F mounting height, distance between dial plane* and mounting flange.

T stem height, distance between dial plane* and stem center

*) Movements with display discs on the dial side (e.g. calendar) occasionally have no dial support.

In this case the surface of the discs is taken as the reference plane for H, F, and T. If a dial spacer that is not permanently fixed is supplied

with the movement, its additional height is stated.

Hands
1.50 x 0.90 x 0.20 mm

Due to the long storage time, small traces may have formed on the movement, but this has no effect on the function.

Because the movement is more than 40 years old, it should be cleaned or at least oiled before installation,

a fine adjustment might be necessary.