This Eterna is not working and very dirty, but looks to be in decent original condition.

The first generation Eterna Matic movements can easily be recognised by the two different sized reverser wheel.

If you remember the super complicated Helvetia this autowinder is much more simple consisting of two intermediate wheels and two reverser wheels.
2 Responses to Service Eterna Matic calibre 1253UD
Another success! Beautiful watch? Mitka, what approximate year would the watch be?
This would be early 1950’s is my guess.