I'm not sure if there's Finnish or Sámi examples in the archaeological record, but I've seen a few examples of Viking era, or just post viking era Scandinavian small knives of fairly similar design. In fact the modern Morakniv is quite similar to a puukko.
I suspect there's a nearly straight line between Viking era knives and the modern puukko (and also the modern Morakniv).
Have fun,
Leif
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