Arko 833

[john sefton]

The North by the Sea on Sweden 
Pilot boat Arkö 833 belongs to the Swedish Maritime Administration and is used to maintain and repair lighthouses and other aids to ensure the safety of maritime traffic along Sweden’s coastlines. The stamp depicts the boat in the vicinity of Häradskär Lighthouse several nautical miles off the coast of Östergötland.
The red lighthouse tower is 29 meters high and was erected in 1863. 
The lighthouse consists of an iron towersupported by a pipe, which in turn is braced by steel beams and wires. Inside the tower is a spiral staircase leading up to the lantern. It is called a Heidenstam lighthouse after the designer, Gustaf von Heidenstam (read more about him on the next page), and is a type of lighthouse that can be quickly raised on hardto-access islands and islets.
Heidenstam lighthouses are a familiar sight along the coasts of Sweden. The collector’s sheet depicts the Pater Noster Lighthouse, which stands on an island at the edge of the archipelago in Bohuslän. It was functional until 1977.
Source: http://www.topoftheworld.nu/
Thanks to Jean-Louis Araignon

[aukepalmhof]

Correct name is ARKÖ.

Not any details on the vessel, it is a small vessel.
On the Pater Noster lighthouse see: https://en.wikipedia.org/wiki/Pater_Noster_Lighthouse