My aunt asked me about a copper colored coin the size of a penny. One side has "One Double 1830" The other side has a coat of arms w/3lines and 3 wheat leaves at the top. It has the inscription: Cuernesey. I have not seen this coin; she described it over the phone. I'm very new at coin collecting and have no earthly idea of what it is or its worth. Has anyone out there a clue?