This is the same period when Vikings were trading all the way to the Black Sea via river routes through Kiev. Wonder if these combs show up in Ukraine and beyond.
An online buddy from years ago said his Scandinavian ancestors' business records showed that during the medieval warming period, they sailed the thawed Arctic Ocean all the way to the Bering Strait, returning the following year, for trade, but obviously they were explorers looking to drum up some business. Of course, I've always kinda wondered about this story...