Does your watch still working ? If it works, I wouldn't change anything, even if it has been redial at some point, it is part of it's history, it looks ok like this and you are not going to sell it anyway. Finding a pristine original dial will not be easy and if you do another redial it will look very new (and it will not be perfect), in both cases, you will not recognize it.
If it works, just have it serviced, there is good watchmakers in Paris, and this is a simple movement.
Don't send it to Omega, it will cost you a fortune.
If you want a specialist in old Omega, someone who can repair or just service this watch, you can check Horlogerie Mendel in Vincennes.
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