ETA 2551

ETA 2551 | - The Movement Archive

ETA 2551


The ETA 2551 is the selfwinding brother of the caliber 2541. With a diameter of only 7 3/4 lignes it is a truely tiny ladies' watch movement, which is also feature-rich. It offers the well known and almost two decades familiar bidirectional winding system as well as a fast switching date mechanism, which can be corrected semi-fast.

Compared to its predecessors like the ETA 2365, you see, that it was produced a little cheaper. The “click spring” of the winding system is now just an ugly kind of wire and the screw balance was replaced by a simple three-leg screw-less balance.

As usual, this ETA movement also contains an (hidden) yoke winding system and an indirectly driven minute hand, which allowed a significantly larger diameter of the balance and thus a higher precision.

This movement was not used for a very long time and rather quickly surpassed by the caliber series 2651, of which the latter one is still used today!

ETA 2551: removed selfwinding mechanism

removed selfwinding mechanism

ETA 2551: ETA 2551 dial side

ETA 2551 dial side

Technical data

Size:7 3/4'''
lift angle:51°
Number of jewels:21
Escapement:Pallet lever
Balance types: Nickel anular balance
Shock protection(s): Incabloc
Balance bearing / direction hairspring:Clockwise
Moveable stud:yes
Adjust mechanism:Long regulator arm
  • lever
  • escape wheel, seconds wheel, third wheel, large driving wheel
  • mainspring barrel
Winding mechanism:yoke winding system
  • SCD (direct center seconds)
  • QG (date indication (aperture))
  • RDR (date corrector)
  • AUT (selfwinding)
References: Flume: K3 151
Mentioning in literature (years): 1968 - 1971

Usage gallery

ETA 2551: Anker 100 S ladies' watch

Anker 100 S ladies' watch