Hi there. I have a hammered silver penny which I think s one of the Edwards. I have a few hammered coins of various grades, kings and denominations, but this one has been mistruck and then struck again over the top off centre. What is this error called? A double strike? A Mistrike? I can't imagine that they are that rare seeing how they were made then. The coin is in pretty good condition apart from being difficult to read as it has been struck twice over the same coin on both sides. H