Auction Series 257-264 in Zurich Day 4

Danube Steam Navigation Co 1870c.: Package Control Stamps, Lithographic Transfers in black, as used to make up the Lithographic printing stones for the issue (unique to the litho printing process), the printer's sheet for "Ostrov-Kalaras", "Kalaras-Silistria" and "Ostrov-Silistria" stamps each with the 40 bani value shown, together with an illustrated letter-head, dated 1 May 1870 alongside the letter-head. Rare and most attractive Proof.
Catalogue 261: Stamp Issuing Steamship Companies