Vintage Scandinavian Viking Brooch/Pendant

Shiny! Approximately 1 7/8" (48 cm) in diameter. Can function as either a brooch or a pendant: has a loop for chain on the back, and a fully functional pin with locking clasp. Based on Viking-era metalwork. This same basic design has been used by makers in both Norway and Finland. I believe this one is from Norway. No maker's mark.