From Stamps of the World
Besko is a village (3,700 inhabitants in 2006) in Sanok County, Subcarpathian Voivodeship, in south-eastern Poland. It is the seat of the administrative district called Gmina Besko.
Postmark in Poland
Postmarks in Austria-Hungary (1890-1918)
The BESKO post office opened on 3 April 1890