Has it been drilled and used?
If so, that will greatly reduce the value to any collector, and that would be the main market for a ball of that vintage.
Undrilled, if you find the right person, it could bring whatever they would pay, but I would estimate around $100-$150 max.
Mind you, this is only a collector item, and really doesn't have any value otherwise.
If it is drilled and used, you probably won't find any market at all for it, but might get a few bucks for it from a person just looking for a cheap ball to have fun with, but it won't be much. If you get anything for it at all, I would be surprised.