Vintage 1950s wool sweater from Norway

Wool sweater with nordic pattern, silver buttons. There is a tar stain or some sort of black stain on the arm. This is an antique sweater but it isn’t musty smelling at all. Some of the weave is loose but for the most part it’s in pretty good condition for as old as it is. No holes, 100% wool. Size is probably a men’s medium or large.