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<p>[QUOTE=&quot;Oldhoopster, post: 8054996, member: 84179&quot;]San Francisco used to send rejected proof planchets to Denver to be coined as business strikes.&nbsp; Some 40% silver planchets from the bicentennial issues were inadvertently mixed with them and were struck as 1977D.&nbsp; As far as I know from the research literature, San Francisco didn&#039;t send rejected plan chefs to Philly, so a 1977 40% isn&#039;t possible.</p><p><br /></p><p>The tolerance for clad halves is 11.34 grams +/-0.454 grams so your 1977D is within spec.&nbsp; 40% halves are 10.50 grams +/- 0.40, so there is an overlap.&nbsp; That means weight isn&#039;t a good indication.&nbsp; Looking at the edge is a very easy way to check.&nbsp; If the core is copper, it&#039;s a normal clad.[/QUOTE]</p><p><br /></p>

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