Omega cal 320 chronographs

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Right. I get it.
But there are many newer watches with the same pushers style and they are water resistant.
Yes, we also have smartphones and the internet now, etc. etc.

Time marches on.
gatorcpa
 
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Got a rose gold 2872-11 model, can't live without this. It's so darn pretty!
Haven't opened it yet, because there are no opening marks and don't want to be the first one to make them. Will take it to the pro.
Is the crown correct?

EDIT: visited local watchmaker (would not work on this piece though 😀)
Seems to be 1958 according to the serial.

Edited: