Auction Series 257-264 in Zurich Day 4

Coastal Ships - Helsingfors Area - Skärgårds Trafik Aktiebolag (STAB) 1873 (June): Imperforate Colour Trial sheet of thirty-five (5 x 7) for the 10 penni value, printed by Lithografiska Tryckeribolaget in Helsingfors, imperforate with each proposed stamp in two or three colours, with position 3 being close to the accepted design and colour of the 25 p. value and position 24 the 50 p. Parcel stamp. Some creasing and faults mainly in the margins but quite beautiful and a masterpiece of lithography.
Catalogue 261: Stamp Issuing Steamship Companies