Yup, I cleaned it while pinned and used 400/1k before oil. Just wanted a light restore and to preserve some of the original character so mainly focused on taking off a layer for hygiene and getting all the dried/flaking bits. If I find myself reaching for it often I could see removing the pins, reshaping the scales (they're a bit warped) and perhaps modifying them to use a wedge (or just replacing entirely), polishing it up all the way (easier sans pin) and doing more work on the blade. But then its age would be less evident and it wouldn't shave any better, just be a bit less fiddly to close when I'm done.
So far this kind of light work in the scales is as far as I've gotten with horn though and I haven't yet taken any further. Does a bit of oil (wiped on, not soaked) render further sanding/polishing impossible? I can see how it'd be less efficient but have assumed I'd still be able to bring it to a higher polish later if I wanted?