cover 1933 (Nov.) envelope from Paris to Malta, bearing Postage Due 1½d. vertical pair cancelled by Vallletta c.d.s. and "C" in circle h.s., and showing framed "Insufficiently addressed" h.s.; 1952 (Feb.) envelope from Uruguay to Gozo, bearing Postage Due ½d. and 2½d. cancelled as last and showing framed "RETOUR/L'ENVOYEUR" h.s. An interesting pair