 Similarly, dating the reforms that brought this new penny coinage into being is contentious.It appears likely that production started at roughly the same time at London, Canterbury and East Anglia, perhaps c. 765–70, and the bulk of the coinage – including the portrait coinage – was probably produced in the 770s and 80s.Later in Offa's reign there was a second reform in which the weight was raised, the size of the flan increased and a common non-portrait design introduced at all three mints.