The 1970 S United States Mint Proof Set features 5 uncirculated coins with a denomination of $5, struck with a proof finish at the San Francisco Mint. This set includes coins with a fineness of 0.9 and comes with certification from the U.S. Mint, making it a valuable addition to any coin collection. The small date on the coins adds to their rarity and appeal for collectors interested in specific years and mint locations.