Very nice tapered planchet. These are remarkably common on wheat cents but generally tougher to find on other denominations. My guess has always been that copper being softer is just more prone to tapering at the roll edges.
@TROP On Mosh scale the silver pure is 2.5 and 2.75 at 900. The copper in pure it is 3 and at 95% (majority of coins) it is 3.15 Hope this will help your feeling about those metals.
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