1921 Morgan Silver Dollar Reverse Lamination Mint Error UNC Details Reverse Cleaned
The Strike Through Error can be visible by the D in United. A strike through error is when some sort of foreign object or substance on either the die, or the planchet (coin blank), somehow got between them during the striking of the coin, and it left an impression on the coin. Thus, the coin was "struck through" this object/substance, which looks to be a possibly a piece of metal.