This is the only known SBA Dollar struck on a copper cent planchet that was also struck off-center (60%). Additionally, it has a uniface reverse since it was only struck by the obverse die. Multiple major mint errors in the SBA Dollar series are very rare.

A copper cent planchet was accidentally mixed with clad planchets for the SBA Dollar. It entered the collar and was struck off-center on top of an SBA planchet. Therefore, only the obverse die struck the copper cent planchet and the reverse die struck the SBA clad planchet. A spectacular, rare and dramatic multiple major mint error in the SBA Dollar series.

Spectacular Errors are featured in
my NLG Award winning book,
World's Greatest Mint Errors.