1971-D Kennedy Half Dollar Error Struck On Silver Planchet 90% 40% clad planchet

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1971-D Kennedy Half Dollar Error Struck On Silver Planchet.Struck on thr planchets from 1970 containg 40 percent silver, thiss Is a recent discovery and you can tell the difference by looking at it. Both of these coins weigh 11.5 g where is every coin from 1971 And forward should weigh 11.34 g. A You can also tell on the side of the coin that the seem is different, see pictures.