I'd say the simplest incarnation of the puukko is the maasepän. This has a birch bark blade cover, useful for knives that won't be carried around, but obviously it's possible to have a leather sheath.
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The rhombic section has been a very common feature on handforged puukko since the 17th century, but probably has been before as well. Its origin seems to come from smiths reforging feather files exploiting their existing geometry. Flat section blades are bit simpler and quicker to forge and tend to have less bite than rhombic ones. After having used rhombic puukkos since 2011 I always find flat section blades to give somehow less satisfaction in wood working.
That is an absolutely lovely looking knife!
I would love to try it out on some wood.
The birch bark sheath is very serviceable. I often make sheaths very similar to this one for knives I and my students make using Mora laminated blades. When I make them, I usually make them with a bark loop at the back of the sheath through which I can put a cord which works well for neck carry, or the cord can be tied to a belt loop and the sheathed knife can be carried in the hip pocket with complete safety. It does require two hand to unsheath or to sheath, because the bark grips the blade quite strongly, with no danger of falling off. When unsheathed the sheath can be left to dangle, reminding the user that the knife is lying around somewhere! (Most lost knives are left lying around.) Birch bark sheaths like this are better than 90% of the leather sheaths that I have seen, and can be made in 5 min. for nothing by someone with access to birch trees.
It does NOT by the way, kill or even seriously injure a birch tree to take some of the outer bark. I have observed trees that have had quite a lot of their outer bark removed for basket making etc., yes all the way around, and those trees have survived just fine for many years. This "if you peel the bark you will kill the tree" stuff is a lie that was told to children to keep them from disfiguring birches in parks etc., and we have just kept on repeating it. (There is a lot of this sort of thing going on.......)