I have been making hunting knives for the last 15 years or so as a hobby. I can tell you that your knife has cutlers rivets in the handle and is probably factory made. It is hard to see in the photo but it looks like it has a thicker ridge running the length of the blade. That was done to make longer knives stronger so they wouldn't break or bend. The scabbard looks home made. May be whats called a "trade" knife, most of these were sold or traded to native populations in various countries. If you can send me some closeup photos or more info, such as handle material, marks, stampings, or symbols on the blade, maybe I can tell you more.