One of four unidentified stamps of an initial C and an earl’s coronet in the database. The following earls were active in 1818, when the book bearing the initial “C” was published: Cadogan; Carlisle; Carnarvon; Carrick; Castle Stewart; Cathcart; Cavan; Cawdor; Chichester; Clancarty; Clanwilliam; Clarendon; Cork and Orrery; Courtown; Coventry; Craven.