>>924569And here's after an hour of sanding with 300 grit and Hoppe's and then sharpening. Not perfect but it's a usable knife now.
I tried a few polishes after taking this photo, Meguiars Ultimate car polish and some silver polish I had in my kitchen, and each had a decent effect, but I don't think it'll show up in photos.
The sheath is trashed after ~60 years of neglect, I think I may try to make a new one.