I am no expert. I assume your talking about the 1976 drummer? If so I understand unless its in a high mint state its worth face value. Maybe some of the real coin URU's here can enlighten you a bit more.
their was contest held to determine the reverse of the bicenentenial quarter. twelve semifinalists were chosen but in the end Jack L. Ahr won. i think he won 5 grand for the very cool design. i beleive ms 65 is worth about a buck. the proof clads are worth about 1 buck twenty five and the silver proofs are worth about 3.