Did the U.S. Mint Quietly Change Coin Die Design? The 2026-P Dime May Hold the Answer A New Look at a Fundamental Change in Coin Die Design For nearly two centuries, United States coin dies followed a remarkably consistent engineering principle. Since 1836, the Mint has manufactured working dies with a convex spherical face rather than a flat surface. Engineers adopted this approach after discovering that flat dies suffered excessive breakage an…
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