The product is a 1978 S Jefferson Nickel from the US Mint Proof Set. This coin is gem proof uncirculated with a deep cameo finish, making it highly collectible. It features a copper composition, a denomination of 5 cents, and was minted in San Francisco. Although it is not certified, its ungraded grade suggests its pristine condition. This coin is a valuable addition to any coin collection, especially for collectors interested in Jefferson nickels from the late 1970s.