The 1993 United States Mint Proof Set includes coins struck in copper at the San Francisco Mint, encapsulated and certified by the U.S. Mint. This set is highly sought after by collectors for its pristine proof condition and includes coins from that year, making it a valuable addition to any numismatic collection. The original envelope adds to the authenticity and historical significance of this set, showcasing the craftsmanship and design of that era.