Thanks to all for the info. I have this out on another forum elsewhere and it does now seem as though it is a George III halfpenny that has been punched by the Robinsons as a form of token or advertising. It seems, for anyone interested in tokens, there is a good book by Dr Gregory Brunk who is somewhat of an expert on the subject. I have yet to find the name of the book, but when I do, I will post it on here. Although I collect and deal mainly in coins, after finding the history on this one, I think I will start looking into tokens and Jetons as well.