Besides Birka, Viking Age equal-arm fibulae are known from important sites such as Hedeby (Germany), Kaupang (Norway), and various graves on Gotland. While the Birka replica impresses with its geometric patterns and a compact, symmetrical form typical of the 9th to 10th centuries, regional variants often exhibit specific differences: Gotlandic fibulae frequently display a more pronounced animal style (predatory animal style) and are often cast more solidly, while finds from Hedeby sometimes show simpler, linear decorations or Frankish influences in the manufacturing technique.