According to the Krause Catalog KM# 877. 1991 B could either be a medal or coin! Does anyone know the difference? The one that I have has a plain and reeded edge. So is it a medal or coin?
Maybe someone with the answer will come along later. In the meantime, the Swedish Mint Website doesn't seem to have an English page, but it does have the mailing address, and there would probably be someone there who speaks English and could fill you in. Good luck, and if you do find out, be sure and post the information for the forum.