Chris, Your coin does look a little suspect to me but mainly due to the colour and patina rather than any glaringly obvious features. Is it possible to have some larger photographs as I am struggling to see the appropriate detail from these small ones? If you want to, you can email photographs to Clive@HistoricCoinage.com As for Kris, Your coin is a halfgroat of Henry VII, Canterbury mint. It looks to be of the joint issue between the King and Archbishop Morton and appears to be type IIIb with ornate lettering and rosette stops. Kindest Regards, Clive.