A picture is essential here. To show the problem;- Henry I moneyers used either C, CA(T)N or CANTLE. Stephen used CANT but also his own name on the obverse (or one of the barons) Henry II used CANTO on the Tealby issues. (no Canterbury coins were issued of the short cross issue) Richard & John both used their fathers name, HENRICVS, on the obverse of their coins and CANT on the reverse but, the moneyer you quote does not appear in the known list. Henry III ,again, although CANT is used, does not have the moneyer listed. So you see the problem - unless you've found an unlisted issue!