Gilroy        Roberts was the former chief engraver for the Mint and designed  the obverse        for this coin. His stylized initials are on the truncation of the  bust. The reverse has the presidential Coat of Arms  was        done by engraver Frank Gasparro. A few pieces dated 1971D and 1977D were struck in silver clad by mistake. From 1965 to 1970 the Kennedy half dollar became a clad coin with the outer layers made of .800 silver, .200 copper bonded to an inner core of .210 silver and .790 copper. I have found one of these so far.
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