Determining my original License Plate Number - HOW?

Thanks guys. Hmmmm....

No, I don't really want to do hours and hours of research on my car. Don't honestly think I'd find much.

Trying to decide: what adds more value to the vehicle? restoring and duplicating my original 1963 series black plate with yellow numbers (which I have the pinkslip for), or just finding a pair of original 1956 series CA yellow plates with black numbers to put on the car?

Thoughts?