1844, Registered outer letter sheet, opened for display, posted from Treviso to Belgrade - Serbia via Austrian Consular post at Belgrade, showing double line TREVISO/9.MAG. handstamp alongside FRANCA and boxed RECCOMANDATA handstamp. Reverse shows scarce Austrian Consular PO BELGRADE with date above and postal charge of 42 centesimo (18+18+6) in manuscript, Scarce destination and usage of Belgrade with date above as a arrival postmark. Ex. Ing. Antic collection 1844, raccomandata da Treviso 9 MAG(annullo 2CO) a Belgrado per l'ufficio consolare austriaco a Belgrado, bolli accessori FRANCO e RACCOMANDATA, al verso l'annullo raro dell'ufficio consolare di Belgrado e la tariffa 42 cent (18+18+6) manoscritta, destinazione molto rara, ex collezione Antic