1877 REGISTERED MAIL CARDIFF TO FRANCE/4D SAGE GREEN PL.15 (SG153). Envelope (slight imperfections) sent registered mail Cardiff to Nantes with 4d sage green pl.15 (SG153) lettered SG and 2½d rosy-mauve pl.9 (SG141) lettered FK, tied neat BUTE DOCKS/D57 duplex NO 24 77. Various other transit date stamps. The 4d overlaps edge of cover but an unusual franking. 4d on cover cat £600. (Ref 100584).