 A mixture of portrait and non-portrait types was struck.Because of the long abeyance of the London mint, considerable support came from West Saxon Rochester in the form of dies and even moneyers, and it is possible that some coins in Berhtwulf's name were actually produced in Rochester.It was once thought that this monetary co-operation was reflected in a unique penny bearing the name of Æthelwulf on one face and that of Berhtwulf on the other.