Should you experience any issues i. Mint Silver Proof Set includes 5 uncirculated Proof coins denominations ranging from 1 cent to 50 cents. The Franklin, Washington and Roosevelt are composed of 90% silver. This set was minted in Philadelphia and comes in the original flat pack envelope w/Cello Sealed 5 coins from the U. The coins are struck in proof quality, making them highly desirable for collectors looking for pristine and authentic pieces from 1955.