Auction Series 257-264 in Zurich Day 4

Coastal Ships - Helsingfors Area - Skärgårds Trafik Aktiebolag (STAB) 1873/86: 10 penni deep reddish-orange, blue & black, line roulette 6, a used example cancelled by ink pen cross on 1884 cover with complete contents from Nalsjo (July 3) to Helsingfors, in combination with Finland 20 p. ultramarine tied by Railway datestamp in black with information strike at right. Rare and most attractive cover.
Catalogue 261: Stamp Issuing Steamship Companies