The 1952 US Mint Proof Set includes 5 coins in various denominations (1C, 5C, 10C, 25C, & 50C), all made of 90% silver. These coins were struck as proofs at the Philadelphia Mint in 1952 and are housed in a Capital Plastic holder for preservation. The set is certified by the U. Mint and is a valuable addition to any coin collection, showcasing the craftsmanship and quality of coins minted in the United States during that time period.