A nice cover from Sweden, depicting a complete Birds set on topic "Birds from the Baltic sea". This set is part of a joint issue with Latvia and Estonia issued in 1992 and there are 4 different bird species from Baltic sea: the Osprey (Pandíon halicetus), the Black-tailed godwit (Limosa limosa), the common merganser (mergus merganser) and the common shelduck (tadorna tadorna).