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<p>[QUOTE=&quot;Hommer, post: 13735571, member: 73266&quot;]It is possible to find a 40% silver &#039;71 half dollar but I know they are quite rare. The weight of the 40% is 11.5 g with a tolerance of +/- 0.4 g. your coins are within those parameters but having them tested is the only sure fire way to tell. Did you try the tissue test with a common clad half and one of these coins? lay a piece of tissue paper over both coins, if one is actually silver, it will show a considerable lighter color telegraphing through the paper.</p><p><br /></p><p>This is one which was sold by Heritage a good while ago.</p><p><a href="https://coins.ha.com/itm/errors/1971-d-50c-half-dollar-struck-on-40-silver-planchet-au55/a/330-9609.s" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://coins.ha.com/itm/errors/1971-d-50c-half-dollar-struck-on-40-silver-planchet-au55/a/330-9609.s" rel="nofollow">https://coins.ha.com/itm/errors/1971-d-50c-half-dollar-struck-on-40-silver-planchet-au55/a/330-9609.s</a></p><p><br /></p><p>Circulated silver clad coinage can be easily distinguished from its nickel clad counter part by looking at the edge of the coin. The silver cladding tends to darken the exposed copper core and leaves it looking a darker grey color compared to a normal nickel copper clad.[/QUOTE]</p><p><br /></p>

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