Cupillard 55-A 21

Cupillard 55-A 21 | - The Movement Archive

Cupillard 55-A 21


The Cupillard 55-A 21 is a pretty interesting movement, since according to the Flume K3 list, it should not exist.

Cupillard made a caliber 55-A, beating with 18000 A/h, but did not produce a 55-A 21, beating with faster 21600 A/h. However, France Ebauches, which was a union of large movement manufactories, including Cupillard, released a caliber 55-A 21, so the “Cupillard 55-A 21” was probably made during the transition and creation process of the France Ebauches.

The three-leg ring balance is beared in two french shock protections of type Antichoc S 65 and golden-toned. Its hairspring is connected with a moveable stud onto the balance cock and has got no long regulator arm for adjustment.

The movement works is pretty much standard with its directly driven minute hand.

On the dial side, you see the yoke winding system and preparations for alternative shock protection systems and cap jewels.

Cupillard 55-A 21: Cupillard 55 A-21 dial side

Cupillard 55 A-21 dial side

Technical data

Caliber:55-A 21
Size:5 1/4 x 8 1/2''' (measured: 12,7 x 19,1mm)
Number of jewels:17
Escapement:Pallet lever
Balance types: Nickel anular balance
Shock protection(s): Antichoc S65
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:yes
Adjust mechanism:Hairspring key
  • lever
  • escape wheel, seconds wheel, third wheel, center minute wheel
  • mainspring barrel
Winding mechanism:yoke winding system
Setting lever spring:3 hole(s)
References: Flume: K3 N1 -

Usage gallery

Cupillard 55-A 21: dial of a KA ladies' watch

dial of a KA ladies' watch

This movement was donated by Harald Hoeber. Thank you very much!

Other movements from Cupillard