1964 Slania Stamps #8 Jack Dempsey (World Champion Boxers) Graded PSA 8 NM-MT. 1991 Kayo #125 Jack Dempsey (All-Time Greats) Graded 10 by All-Star Grading Company. Nice Looking Jack Dempsey Items. Jack Dempsey was a Great Professional American Heavyweight Boxer for many years. Was the World Heavyweight Champion from 1919-1926, which was very impressive. Also has A Great Boxing Nickname “The Manassa Mauler”. Please view all Photos. Thanks for looking.