This tune is by Johan Leonard Larsson, better known as Viksta-Lasse. He was a well-known fiddler from Eklunda in Uppland who played with the famous nyckelharpa player Eric Sahlström starting in the 1930s.
There are three famous Eklundapolskor; maybe I’ll post the other two someday! In the meantime, here’s number three:
If you’d like to play it too, here is sheet music complete with suggested chords (just right-click to save and print the image):
Gilbert Music Studio 