Omega didn’t start using the “T” for tritium until 1963. This watch may have been made before then. I also think that the lume may have been refreshed at some point.
You will need to take it to a watchmaker and have it opened to get the case reference and movement serial number.
Also, not all dials had onyx markers. Yours looks OK to me, although the crystal could use a polishing.
Nice watch.
gatorcpa
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