ETA 2551

 
ETA 2551

ETA 2551

Description

The ETA 2551 is the selfwinding brother of the caliber 2541. With a diameter of only 7 34 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!

removed selfwinding mechanism

removed selfwinding mechanism

ETA 2551 dial side

ETA 2551 dial side

Technical data

Manufacturer:ETA
Caliber:2551
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
Construction:
  • lever
  • escape wheel, seconds wheel, third wheel, large driving wheel
  • mainspring barrel
Winding mechanism:yoke winding system
Features:SCD,QG,RDR,AUT
Functions:hour, minute, second, day, selfwinding
A/h:21600
Size:7 3/4'''
Literature: Flume: K3 151

Usage gallery

Anker 100 S ladies' watch

Anker 100 S ladies' watch