Joe DiMaggio Gem Mint 10 Autograph on an OAL Bobby Brown Baseball. Lot 390. Joe DiMaggio Gem Mint 10 Autograph on an OAL Bobby Brown Baseball. Sweet spot signature on an nm baseball with strong pre-printed areas and very light, scattered discoloration. Authenticated by Kevin Keating. Winning Bid $218. Back to List Winning Bid $218 Back to List