The blade looks like it's had some contact with something pretty acidic. Looks like some other stainless blades that've been deliberately darkened with strong acids. Stainless steel wouldn't ordinarily 'patina' like this otherwise. Might take some aggressive sanding to clean that up, although the oxidation is likely just a cosmetic issue. Don't think any further harm will result from it.
Don't know if you're dead-set on cleaning it up yourself as a project. But, Buck has an excellent reputation for their 'spa treatments' on knives sent back to them, at little or no cost to the owner (maybe shipping). For the blade, that might be the easier way to handle it, and they'll also re-sharpen it if needed. They'll also do a great job cleaning up the brass & wood scales. If you choose to do it yourself, you can use wet/dry sandpaper to work the dings out of the brass. A tight sanding sequence of about 400/600/800/1000/1200/1500/2000 grit, plus polishing with metal polish like Flitz/Simichrome would make them gleam again. I did some of this on one of my own knives (Buck 112) a while back. Details of how I went about it are posted in this thread, linked below (with more follow-on in subsequent posts):