I have a Spink, JJ North's book, as well as SCBI Vol. 39, and another http://www.ukdfd.co.uk/pages/edwardian-Pennies/Edwardian Pennies P17.htm#Identification website. Is there a reference, book or other, for the mules/errors/varities of Edward I pence? SCBI and the Fox brothers talk about them, but is there a reference?
