FEF 6640

 
FEF 6640

FEF 6640

Description

This really tiny (only 4 x 6 lignes = 10.4 x 14.3mm) form movement FEF 6640 from Fleurier, here used by Chopard, not only belongs to the smallest, but also to the best quality ladies’ watch movements in the archive.

base plate

base plate

This beautifully golden and extensivly decorated base plate shows, that it is a high quality movement.

Even the minute wheel is ruby-beared, and the normally invisible plate below the mainspring barrel is decorated with a perlage.

gear train

gear train

Since the movement is that tiny, the very filigree escape wheel has to be located below the seconds wheel bearing, so we have a multi-storey construction here, which is pretty usual on movements of this tiny size.

The gear train is standard: The mainspring barrel drives the center minute wheel, followed by thied wheel, seconds wheel and escape wheel.

Seconds wheel and escape wheel are beared under their own bridge, a very service-friendly construction.

side view of the gear train

side view of the gear train

The FEF 6640 uses a three-leg golden toned Glucydur balance without screws. Of course, it is beared in two Incabloc shock protections.

It already beats with 21600 A/h; the only small drawback is, that it can be regulated at the hairspring key only.

FEF 6640: Dial side

FEF 6640: Dial side

The golden toned dial side makes a perfect impression, too.

Of course, the FEF 6640 uses a yoke winding system. It’s setting lever spring also secures the exchanger wheel.

The position of the dial-side Incabloc shock protection tells us, how few space this tiny movement can offer, because it is pushed to the upper right edge.

Technical data

Manufacturer:FEF
Caliber:6640
Size:4 x 6''' (measured: 10,4 x 14,3mm)
A/h:21600
Number of jewels:17
Escapement:Pallet lever
Balance types: Glucydur anular balance (three legs)
Shock protection(s): Incabloc
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:3 hole(s)
References: Flume: K3 76
Mentioning in literature (years): 1968
Inventory number:20050

Usage gallery

Chopard ladies' watch  (case missing)

Chopard ladies' watch (case missing)

This movement is a kind donation from Philipp Porter to the movement archive. Thank you very much for your great support!