cover 1867 5Kr. postal stationery envelope (faults mainly confined to reverse) registered to Cacsak (Serbia), uprated with 1867 2Kr. and 10Kr. and all cancelled by "WIEN/FILIALE" c.d.s. in blue, Beograd transit c.d.s. on reverse. An appealing three colour combination and a rare 17Kr. registered rate to Serbia. Photo