I've got some Helle Puukko knives
No, you don't. Puukko is a Finnish word, Helle is Norwegian. You may have a
tollekniv, which admittedly is pretty much the same thing, but in a completely different language.
Both words derive from woodworking, which is what any general purpose Scandinavian knife must do, in addition to cleaning fish and game, camp cooking... We're forest people, a knife is not just a tool, it's the tool you can't be without in the woods. I don't quite remember when I got my first "real" knife (sharp edge, laminated steel, good quality) but I think my mother bought me one for my fifth birthday. In case you're wondering - yes, I did cut myself with that knife. On a hunting trip about 20 years later.
Helle are nice but the ones I've had were stainless and have to go to a sharpener to get a really good edge.
I can't remember having had any particular difficulty sharpening one, but that may just be my memory fading. They make both laminated stainless and laminated carbon steel blades, so the center layer is a bit harder than you might expect in a non-laminated knife. I think Helle also sells all their designs as blades only, for those who like to make their own handles and sheaths. An "arty" knife in Scandinavia is a functional knife with a fancy handle (pretty wood, silver fittings and such) in a good looking leather sheath, not a 24 inch saw toothed recurved double edged monstrosity, but I'm digressing.