1958 United States Mint Proof Set. We are pleased to offer this vintage 1958 US Mint Proof Set, completely intact and still factory sealed inside its original Treasury Department envelope. This classic “flat pack” configuration comes directly from the Philadelphia Mint and represents a fantastic piece of American numismatic history. Collector’s Note: This set remains entirely unopened. Year of Issue: 1958. Total Set Mintage: 875,652. Packaging Type: Original Sealed Government Envelope (“Flat Pack”). Set Contains (5 Proof Coins). (1) Franklin Half Dollar (90% Silver). (1) Washington Quarter (90% Silver). (1) Roosevelt Dime (90% Silver). (1) Lincoln Cent Final year of the historic “Wheat” Reverse design! WOULD MAKE A FANTASTIC ADDITION TO ANY COIN COLLECTION! Thank you for shopping with Sparta Surplus. Please check out our other listings for more vintage collectibles.