U.S. Mint 1955 Silver Proof Set. This Set is in the Original Manila Envelope that was issued from the U.S. Mint more than 50 years ago. Here's what's included in this proof set: 1955 Lincoln Cent, 1955 Jefferson Nickel, 1955 Roosevelt Silver Dime, 1955 Washington Silver Quarter, and the 1955 Franklin Silver Half Dollar. And all in the original US Government packaging!!