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 very fine