1980 United States Proof Set, 5 Coins Inside!. Original packaging: In 1980, the packaging for the Proof Sets was down-sized to accommodate the smaller Dollar coin. At the same time, the Mint got rid of the red, felt-covered paper insert that was notorious for shedding tiny flecks of red "dust" onto the coins. Instead, the coins of the 1980-S Proof Set were placed in individual holes in a red plastic insert, then sealed in a two-piece, clear plastic case. The coins of the 1980-S Proof Set were placed in individual holes in a red plastic insert, then sealed in a two-piece, clear plastic case. The clear plastic case containing the coins slid into a molded, black plastic frame, with the raised silver letters "UNITED STATES PROOF SET" for storage. For display purposes, the frame served as a base for the case containing the coins, which fit into a slot in the frame. A black card slipcase, imprinted in silver with the words: "United States Proof Set • 1980", protected both the case and the frame.