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<p>[QUOTE=&quot;Tim Sweet, post: 3595337, member: 103085&quot;]I got an email from a guy that said he had 1971-D Kennedy Half Dollars that were sliver.</p><p><br /></p><p>I looked here at Cointalk for some posts and I did a little Google Fu.</p><p><br /></p><p>While it&#039;s true there were some 40% planchets at the Denver Mint that were struck for the 1971-D&nbsp; Kennedy, they would be extremely rare find.</p><p><br /></p><p>Here is some research:</p><p>Note:&nbsp; I read somewhere that 40% coins don&#039;t show the copper on the edges(reed).&nbsp; That&#039;s not true in Quarters and Half Dollars</p><p><br /></p><p>FROM ANACS web site:</p><p><br /></p><p>ANACS has graded and encapsulated as About Uncirculated 50 a 1971-D Kennedy half dollar that was struck on a silver-copper clad planchet instead of the intended copper-nickel clad planchet.</p><p><br /></p><p>John Veach from Marshall’s Coin Shop in Wymore, Neb., said the coin was among circulated coins purchased over the counter.</p><p><br /></p><p>ANACS senior numismatist Michael Fahey said graders relied on the 40 percent silver 1971-D coin’s specific gravity in making the silver-copper clad determination.</p><p><br /></p><p>The coin’s specific gravity is 9.5, close to the standard 9.53 for silver-copper clad, with a weight of 11.44 grams, within tolerance of the U.S. Mint standard 11.5-gram planchet.</p><p><br /></p><p>Specific gravity for copper-nickel clad is 8.92 and a coin’s weight is 11.34 grams.</p><p><br /></p><p>When introduced into circulation in 1964, the Kennedy half dollar’s alloy was 90 percent silver and 10 percent copper. From 1965 through 1970, a silver-copper clad composition was used. In 1970, 40 percent silver/silver-copper clad planchets were used for the production of Proof half dollars at the San Francisco Mint and Uncirculated Mint set coins at the Denver Mint. No half dollars were struck for circulation.</p><p><br /></p><p>The silver-copper clad composition was discontinued in 1971 in favor of the copper-nickel clad composition, but returned for the collector versions of 1776–1976 Kennedy, Bicentennial half dollars.</p><p><br /></p><p>FROM:</p><p><a href="https://treasurepursuits.com/1971-kennedy-half-dollar/" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://treasurepursuits.com/1971-kennedy-half-dollar/" rel="nofollow">https://treasurepursuits.com/1971-kennedy-half-dollar/</a></p><p><br /></p><p>After the removal of silver, the weight of the Kennedy Half Dollar dropped from 11.50 grams to 11.34 grams. The removal of silver also resulted in a new composition of 75% copper, 25% nickel. The diameter remained unchanged from previous half dollars at 30.6mm. Reeding can be found on the edge of the coin.</p><p><br /></p><p>Rare 1971-D Kennedy Half Dollar Planchet Error</p><p><br /></p><p>Even though silver was supposed to be removed in 1971, some planchets that were made from the previous 40% silver composition slipped through and were struck with dates bearing 1971. This is a major mint error as all 1971 Kennedy Half Dollars were to be made with 75% copper and 25% nickel planchets.</p><p><br /></p><p>Recently a 1971 Kennedy Half Dollar minted at the Denver mint was found to be a genuine specimen with a 40% silver planchet and bearing the 1971 date. This coin was graded AU-50 by ANACS.</p><p><br /></p><p>The amount that may still be outside of collections is probably very small. Only a couple silver planchets could have been stuck in a bin, and the possibility of them all being found is even lower. This means that 20 or fewer examples may still be in existence.</p><p><br /></p><p><br /></p><p>So go check the specific gravity of all your 1971-D Kennedy Half Dollar.</p><p>&nbsp;</p><p><img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" />[/QUOTE]</p><p><br /></p>

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