A rare coin from the reign of Magnus Barefoot — sometimes called Norway's last Viking king, was mistaken for a button before researchers realized it was the first of its kind found on Norwegian soil.
When you buy through links on our articles, Future and its syndication partners may earn a commission.
A metal detectorist in Norway dismissed a rare 900-year-old silver coin as a button, before researchers realized it was a one-of-a-kind piece linke... [5209 chars]