Should be a good knife. That pattern is an old one and hard to improve upon for most outdoorsmen. Is it "Wingdon" or "Wingen?" I see stuff about "Anton Wingen" marked blades from time to time. Is there perhaps a profile of a man's face etched on the side marked "Wingdon/Wingen?"
Othello is an old Solingen company. I found some Othello knives for sale at various places on the web, but none like yours. Most were small "boot-knife" type daggers or hunters with slab handles. There were several references to "Othello/Russell" knives, which might mean that Othello knives were imported by A.G. Russell and sold as A.G. Russell knives. There was a leaf-shaped "Canadian-style" belt knife, in particular, that looked similar to the leaf-blade Canadian knives A.G. Russel used to offer.
That's not much, but it's all I found. You could probably dig deeper. Try searching under "Wingen." I searched with Wingdon and got nothing, so I searched for "Othello knife Solingen" and got quite a few results that talked about Othello knives marked "Anton Wingen."