The 1975 Clad Proof Set U.S. Mint Original Government Packaging OGP is an uncirculated set of coins from the United States Mint. This set includes various denominations such as 1 cent, 5 cents, 10 cents, 25 cents, 50 cents, and $1, all struck in proof quality. The coins are composed of a copper alloy and copper-nickel, and they are graded as proof. This set is a valuable addition for collectors interested in US coins from the 1970s.