Is 1970 half dollar silver

6-18-11>>> None of the Eisenhower's released for circulation have silver. For 1971 & 1972 only, all S mint marked coins are 40% silver proofs. From 1973 to 1976 the S mint marked coins in the standard proof sets are clad coins, the 40% silver Ike's were sold separately but they were included in the bicentennial 3-piece silver sets. No silver Ike's were struck in 1977 or 1978.