This stamp sheet is called 'Dog Hill Kids at the Post Office' and shows postmen, the post office, a post-horn and of course a letter box. The fact that the postman is carrying a sword intrigued me but beyond the interesting fact that when one receives a PhD in Finland you wear a silk top hat and a sword for the ceremony I could find no information. The stamp sheet scene is from the imagination of Mauri Kunnas, graphic designer, political cartoonist and children's author whose books have been translated into many languages, his Santa Claus books being especially popular. He mostly sets his stories in Finland's past and the Dog Hill Kids series is no exception being set in the early 1800s based on the Yli-Kirra Peasant Museum in Punkalaidun which is near his hometown. For the Dog Hill enthusiast there is even a Dog Hill section in Tampare's Adventure Park. His anthropomorphic dogs have also appeared in a retelling of the Finnish epic poem, the Kalevala, whereas his King Arthur's Round Table feature cats. Some more of his illustrations can be seen in the article 'Lovable, Instructive Canines' here.
Wishing you all a Happy and Healthy New Year filled with postal delight.