What is the value of an uncashed winning ticket in perfect condition on Secretariat in 1973 at the Belmont Stakes for the Triple Crown Winner?

It is worth what somebody will pay for it. There were approximately $5000 uncashed tickets, some were probably lost. Could speculate that someone might pay up $10,000 for the ticket, but that does not mean it is worth that much. Some people know the cost of everything and the value of nothing. Good luck in finding one; they are few and far between, and have not seen to many of them for sale.