Type: Proof Set Year: 1970 Number of Coins: 5 Face Value: $0.91 Issue Price: $5 Silver Weight:.147893 oz. The 1970 proof set contains five different coins, and one of them is 40% silver. The coins include: the penny, nickel, dime, quarter, and silver half dollar. The S mint mark can be found on each coin. There are different varieties for the 1970 S pennies.