(Set of 4) UNOPENED Original US Mint 1961, 1962, 1963, 1964 Silver Proof Sets 6 April 2025April 6, 2025adminunopenedmint, original, proof, sets, silver, unopened 1961, 1962, 1963, and 1964. “UNOPENED” Sealed Silver Proof Sets. Great Condition (No pen marks or writing on envelopes). Please visit our other listings. Please carefully study the pictures. To determine if these coins meet your requirements.