Auction Series 257-264 in Zurich Day 4

Danube Steam Navigation Co 1867: 10 kr. green, Type I, used on 1872 entire letter from Lom-Palanka to Philippopoli (Plovdiv) endorsed 'via Belgrad', tied by oval framed AGENTIE / D.D.S.G. / LOM PALANKA in blue (Tchilinghiran fig. 898). The cover travelled via Baziasch, Hungary (Sept 9) and Belgrade and then by the train. Charged '20' kreuzers due in blue crayon for two unpaid stages within the Empire Post. A most unusual entire, initially routed in the opposite direction (North West up the Danube) to the letter's destination (South East of Lom Palanka).
Catalogue 261: Stamp Issuing Steamship Companies