These coins are a copper-nickel composition, being a nickel jacket over a copper core. Anything after 1970 contains no silver, with the exception of errors listed below.
This was only the second year that the US Mint issued Kennedy Half Dollars in a non silver state. The mint mark for the 1972 Kennedy Half Dollar is on the Obverse/Front. 3.2 million 1972 Proof Kennedy Half Dollars were minted here at eh San Francisco mint.
