I collect Norwegian/Scandinavian Knives...
I just looked through a book I have:
Norsk Knivbok by Oystein Kostveit.
Judging from your very sharp photos of the knife and sheath, and looking at both the 'style' of the knife handle and blade and also the sheath, front and back...
While I am not an expert, my personal opinion is:
The Knife and Sheath are likely later than the 20's or 30's...
I am really thinking Post-War For Export.
I think someone took a lot of time and effort to carve the wooden handle...
It was/is a 'simple' knife...typical of the genre...
The Blade especially strikes me as a Commercial Blade...
Not Likely from the '20's-30's...
The Sheath is very much typical of the Post-War Era...
It Definitely Is A Keeper!
I Would Be Happy To Have It In My Collection!
I Think It Could Sell For $100+-.
So, Maybe Hang It On The Wall And Don't Use It!

(Quick Note: I have observed over the last dozen years, that many of the Norwegian/Swedish Knives on ebay, that have come out of 'estates' from the Midwest....are now being bought on ebay, by buyers from Norway...no doubt to be put in Antique Stores over there, to be bought at inflated prices by American Tourists, to be brought back to the U.S.A.!

)
CAVman in WYoming