\"WEILBURG 29 1 1856\" respectively \"WEILBURG 27 8 1858\" - single circle postmark with JZ, on two in red \"9\" respectively in blue \"4 / 1\" rated Postal Union letters over Giessen and Cassel to Mulhouse R. B. Erford, of it latter with printed letterhead \"Audenschmidte by Weilburg\", nice pair of letters in good condition