To clean the knife or not to clean the knife.

I get asked that a lot and you just dont see enough knives from this era sell to get a good feel for the effect cleaning might have on the price. The rule I follow for my old Bucks is that unless one is covered in rust, or big pitts, or maybe just old goo, I leave it alone. A lot of my knives have stains on the blade and I rather leave them be.
Lines that may look like scratches are actually original grind lines left in the blade by Hoyt or Al Buck and anything resembling the original finish is better than a modern finish.
I remember one like yours coming in from Canada once with instructions to clean, buff and sharpen. I called the owner first and tried to talk him out of it but he wanted to use his knife. I really couldn't blame the guy as that IS what the knife was made for.
As a collector, the cleaned knife looked hideous to me and if I saw it for sale, my offer would be much lower than it would have been if he left the knife alone.
Looking at your knife you can see what looks like honing scratches along the blade edge and the top of the hollowgrind. If it were my knife, I might try to blend them in but most likely would just leave the knife as is.
I hope this helps.