1964 and before are 90% (currently .36 oz of silver) and 40% are 1965-1970 (they have .14 oz of silver). The proofs are a different story though. Some are 40% and some are 90%. the 1976s proof MAY be 40%. they started to make some 90% silver proofs in 1992. They have both 90% and clad.



















