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Omega

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The caliber 343 (if I am not misinformed) existed both as Chronometre and non-chronometre.


As for the crown, yes it is replaced.

Please post some better photos of your dial and inside of the case back + movement.
Maybe we can find some more info on your watch...

Here is a scan from a 1958 Swedish Omega catalog showing a similar watch as yours without the Chronometre...


Hope this helps.

Best
Blomman

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