Please provide us with some nice pictures of the movement numbers (caliber and serial number) and the inside of the case back. that will make things a lot easier. Unfortunately Dan is right, the dial was more or less erased at some point in its moved live. If its a family piece like that, you might want to keep it as such. Or maybe, if you know what the watch number is, you might want to find a nice original dial that fits so you can wear it the way it originally left the Omega factory somewhere around the 60ies I think.
You can still keep the dial to the watch as part of its history.
Cheers,
Tom