History of South America

What is the value of a 1977 d silver quarter us mint stopped production but made mistake and stamped some quarters on plugs?

There is no such thing as a 1977 d quarter. Production of quarters ceased in 1976, and therefore any 1977 quarters are counterfeit. Additionally, the d mintmark hasn't been used on quarters since 1964. As such, a 1977 d quarter is not a genuine coin.