The 1964 Denver Proof Set includes 5 uncirculated silver coins with a fineness of 90% silver. Minted in Denver by the U. Mint, these coins are certified as proof sets. Each coin features a strike type of proof, making them highly collectible. Despite being mint errors, these silver coins have a unique and valuable appeal to collectors interested in rare and unique coins. A great addition to any coin collection, this set showcases the craftsmanship and precision of the United States Mint in the 1960s. Dime has dark spots on front, Quarter has marks on Right side of wing most likely caused by a die error and the Half Dollar also has marks on Kennedys neck Left of his ear and on the top of his head. There are no puncture marks on the plastic so any marks on all coins were done by mint.