The product is a set of 1961 to 1964 U. Proof sets, each containing coins composed of. 900 silver such as dimes, quarters, and half dollars. These sets were minted in Philadelphia and come with envelopes for safekeeping. Each set includes coins struck in proof condition by the U. Mint, and they are classified as circulated/uncirculated proof sets. Ideal for collectors interested in a complete set of U. Coins from this specific time period.