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Burnishing Ball Trapped Clad Layer
Burnishing Ball Trapped In Clad Layer

This is a relatively new US Mint Error discovery as reported by minterrornews.com in 2010 and certified and attributed by NGC Numismatic Guarantee Corporation. Minterrornews.com reported that it was found in a US Mint bag for Presidential Dollars and some how the burnishing ball, used to burnish planchets, got trapped inside the clad layer.
More images of the mint error can be found here minterrornews.com

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