Heres a photo of what I am unsure about
The frog is clearly misaligned I think, and I'm not sure if it's a good idea to eyeball realignment, and don't have any precision measurement tool to verify. That's the worst thing beside the depth adjuster, which maybe doesn't work precisely because of the frog being misaligned, I'm not sure.
There's rust all over the body but I think I can clean that probably, some rust spots on the blade and guard, and cleanest of all is the lever cap that only has a bit of rust where it engages the screw it uses as fulcrum