#543 Denmark...Thanks Poul!

The 2.80k stamp on the cover is from 1980 Nordic Sister Towns issue showing Aalborg Harbour.
Aalborg is a Danish industrial and university city in North Jutland. The city of Aalborg is the fourth largest city in Denmark in terms of population.

Aalborg maintains cultural, economic and educational ties with 27 cities around the globe.Thus, Aalborg has the most twin cities in Denmark. Every four years Aalborg gathers youth from the majority of its twin cities for a week of sports games, known as Ungdomslegene (The Youth Games).There are 4 city names shown on this stamp:
Karlskoga, Sweden
Fredrikstad, Norway
Húsavík, Iceland
Riihimäki, Finland

The 3.00k stamp was issued in 1987 commemorating Ribe Cathedral redecoration from 1982-1987,by Carl-Henning Petersen,showing fresco in the cathedral.Carl-Henning Petersen was a Danish painter and a key member of the COBRA movement. He was known as the "Scandinavian Chagall", and was one of the leading Danish artists of the second half of the 20th century.

The 2.70k stamp was issued in 1984 commemorating 300th birth anniversary of Ludvig Holberg.

Ludvig Holberg (1684–1754) was a writer, essayist, philosopher, historian and playwright born in Bergen, Norway, during the time of the Dano-Norwegian double monarchy, who spent most of his adult life in Denmark. He was influenced by Humanism, the Enlightenment and the Baroque. Holberg is considered the founder of modern Danish and Norwegian literature,and is best known for the comedies he wrote in 1722–1723 for the theatre in Lille Grønnegade in Copenhagen. Holberg's works about natural and common law were widely read by many Danish law students over two hundred years, from 1736 to 1936.