Mike...I wish I had my copy of The Billiard Encyclopedia here with me. It's still in a storage locker out in MT. IIRC they quit making round chalk in the 20's. I have no idea if Joe was a collector, but it seems fairly unlikely, as he sold his cues to various people for almost nothing. My good friend, Jerry Briesath bought Joe's Balabushka, after Joe did an exhibition in Jerry's room in Madison, WI, for only a few hundred. Jerry held on to it for decades, and sold to a collector friend of mine recently for $26,000!
Scott Lee
www.poolknowledge.com