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<p>[QUOTE=&quot;Hobo, post: 1137682, member: 11521&quot;]It is highly unlikely your coin is 90% silver because the Mint did not produce any 90% silver half dollar planchets after they stopped minting 1964 KHDs (circa early 1966 if I remember correctly). Could a 90% silver planchet have gotten stuck in a hopper for 7 or 8 years and fallen out in 1974? Sure, anything is possible but I think that scenario is highly, highly unlikely. </p><p>&nbsp;</p><p>Your best bet is to weigh the coin and go from there. Your ear may be finely tuned enough to distinguish the metal content of coins but the weight test is more meaningful to most coin collectors. If the weight test is inconclusive I would recommend doing a SG (Specific Gravity) test. If, after the weight test and SG test, you are still convinced it is a 90% silver KHD I would recommend that you submit it to PCGS or NGC for authentication.[/QUOTE]</p><p><br /></p>

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