The coin you are referring to is a Bicentennial Silver Dollar, minted in 1976 to celebrate the 200th anniversary of the signing of the Declaration of Independence. It is a legal tender coin with a face value of one dollar, but it is worth more than its face value due to the silver content. The melt value of a Bicentennial Silver Dollar is currently around $19, but its actual value may be higher or lower depending on the condition of the coin and market demand.