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<p>[QUOTE=&quot;BR549, post: 1200352, member: 7110&quot;]All business and proof coinage struck during 1971 thru 1974 are composed of COPPER-NICKEL CLAD (Outer layers - 75% Copper, 25% Nickel, Center - 100% Copper)</p><p><br /></p><p>In 1975/1976 (all coins struck in these years are the 1776-1976 dated Bi-centennial coinage)</p><p><br /></p><p>40% silver Circulation strikes: estimated 5,000,000</p><p>40% silver Proofs: estimated 4,000,000</p><p><br /></p><p>There was also 234 million clad (non-silver) Philadelphia and 287 million clad Denver and 7 million clad Frisco halves minted in 1976</p><p><br /></p><p>So, during the time frame you mentioned, the only halves you need to worry about are the San Fransisco minted (S mint mark) for the Bi-centennial coinage from 1976</p><p><br /></p><p>BTW: The tissue paper (Kleenex layer) really does work![/QUOTE]</p><p><br /></p>

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