Cover with manuscript 'Alo. Fyrboder A E Hansen a S/S Svendborgsund. D/S Cadan, Forbindelsevej. Kjobenhavn, Danmark, Europa' on flap franked with 1920 single 400rs blue 'Industry' issue (SG 315) tied by fine strike of AALBORG arrival cds. Addressed to AALBORG, DENMARK. Very unusual.