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ETA 2551

 

ETA 2551ETA 2551

Description

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 2651/2671, of which the latter one is still used today!

removed selfwinding mechanismremoved selfwinding mechanism

ETA 2551 dial sideETA 2551 dial side

 

 Technical data

ManufacturerETA
Caliber2551
Number of jewels21
EscapementAnchor with pallets
BalanceNickel
Shock protection(s)Incabloc
Balance cock directionclockwise
Hairspring studmoveable
Regulator typeLong regulator arm
Movement constructionFork
Escapement wheel, Fourth wheel, Third wheel, Large driving wheel
Mainspring barrel
Winding mechanismyoke
FeaturesSCD,QG,RDR,AUT
FunctionsHour, minute, second, day, selfwinding
Beats per hour21600
Size73/4'''
Image in Flume Werksucher K3 151
ETA 2551ETAETA25517 3/4''''''ETA 255121 Jewels, 7 3/4'''''', 21600 A/h, SCD,QG,RDR,AUT
Factsheet

 

 

Usage gallery

Anker 100 S ladies' watchAnker 100 S ladies' watch