Check the listing for details. 1987 United States Mint Proof Set. Made in United States. Listed at 5.00 USD. The 1987 United States Mint Proof Set is a highly sought-after collection of uncirculated coins minted in San Francisco by the United States Mint. This set includes a variety of coins struck in proof condition, making them ideal for collectors looking for coins in pristine condition. With the official certification from the U.S. Mint, this set is a valuable addition to any coin collection, showcasing the craftsmanship and historical significance of American coinage from the year 1987.