Each Silver Proof Set contains .61487 ounces of Silver! Imagine being able to look at proof sets that have never been opened after more than 45 years! These sets will be from the final years when U.S. Proof Sets were made at the Philadelphia mint and contain 90% Silver dime, quarter, and half-dollar. Years will be of our choosing, from 1961-1964. These sets are still in their original mint packaging and unopened!