Could this be the same ball sold by Christie's in 1998?
http://www.christies.com/lotfinder/1...7-44e13edc50d4
Also, I'm wondering about the LOA which specifically mentions an embossed seal that should appear over Spence's signature which my eyes can't see in the scan. The wrinkle in the paper to the right shows up, but I don't see any embossing on that page. Maybe nothing, but strikes me as odd.