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<p>[QUOTE=&quot;Conder101, post: 1447520, member: 66&quot;]I know a few 40% 77-D&#039;s exist but I&#039;ve never heard of a confirmed 71-D 40%.&nbsp; Frankly I would be very skeptical that they would exist.&nbsp; Business strike 40% halves had not been struck for two years.&nbsp; Yes 40% 70-D&#039;s were struck for mint sets but I would suspect that the planchets for those were more carefully accounted for, and the striking of the coins was quite possible in a separate section than the business strike coinage so it would not be likely that the planchets would get into the production area.</p><p><br /></p><p><br /></p><p>No.&nbsp; The tolerances for the clad and 40% planchets were so loose that there is considerable overlap in the weights.&nbsp; A copper nickel clad half could weigh anywhere from 10.88 grams to 11.79 grams.&nbsp; A 40% half could weigh anywhere from 11.1 grams to 11.9 grams.&nbsp; So a coin that weighed anywhere from 11.1 to 11.79 grams could be either composition.</p><p><br /></p><p><br /></p><p>The tissue test would be a good first test, but the only sure test to prove it would be a specific gravity test.&nbsp; A copper nickel clad will have a SG of 8.92 and the 40% silver half is 9.53&nbsp; Weight tolerance variations will not affect this.[/QUOTE]</p><p><br /></p>

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