The 1964 U.S. Mint Proof Set is a historically important five-coin collection specially struck at the Philadelphia Mint for collectors. It contains the Lincoln Memorial Cent, Jefferson Nickel, Roosevelt Dime, Washington Quarter, and Kennedy Half Dollar, with the dime, quarter, and half dollar composed of 90% silver. The set is especially significant because it introduced the Kennedy Half Dollar, issued only months after President John F. Kennedy’s assassination, and it marked the final year that regular-issue U.S. dimes, quarters, and half dollars were all struck in 90% silver. Each coin was produced using polished dies and carefully prepared planchets, creating sharp details, brilliant mirror-like fields, and occasional frosted cameo contrast. With a mintage of 3,950,762 sets, the 1964 Proof Set remains one of the most popular vintage U.S. Proof Sets because of its historical importance, substantial silver content, original Mint packaging, and enduring collector appeal.