There's a guy on ebay minnesota.fats. He's currently selling a bunch of unique old Brunswick stuff.
For years and years he bought up all the best antique billiard equipment.
Message him on ebay, he may be able to help you.
There's also, Mr. Stelinga, who was pretty active on here for awhile. He literally wrote the book on collectible ball sets.
I forget his username, but someone else may remember.