The 1970 United States Proof Set is a highly sought-after collectible item consisting of uncirculated coins struck in proof quality at the San Francisco Mint. This set includes coins from the United States with certification from the U.S. Mint, making it a valuable addition to any numismatic collection. The set offers a glimpse into the coinage of the United States in 1970, showcasing the craftsmanship and design of that era.