You are purchasing an Rare Uncashed Winning Betting Tote Ticket for the 1977 Kentucky Derby won by Seattle Slew and he went on to become one of only 13 horses in history to win the triple crown!
This rare uncashed 1977 Winning Betting Tote Ticket is ungraded, PSA told me they do not grade them anymore, BUT it looks MINT to me and would probably grade at least a 7.