If you ever have any issues with verdigris staining on stag or bone, from contact with brass pins, liners, etc., a polishing paste like Flitz or Simichrome works pretty well to clean it up. I think the ammonia-based suspension in the paste is advantageous for this (I've often read of ammonia solutions as a cleaner for vergigris staining). I cleaned up some verdigris staining around the pins on a 1970 stag-handled Peanut of mine, using Flitz, with good results.
BTW, the polishing paste also works very well for buffing up bone & stag handles as well. Just try to minimize overlap to adjacent metal (nickel, brass, etc), to keep the dark swarf from those areas from being rubbed into the bone or stag. It can happen, but the polishing paste can also help clean that up (I've done it, and it's fixable).
On unstabilized wood, I've occasionally used a very, very light application of mineral oil or 'lemon oil' (almost entirely mineral oil) to keep it from getting excessively dry. I've not needed to do this more than 2 or 3 times a year, often just utilizing leftover oil on a clean rag, after wiping down the blade, etc. That's enough to get it done.
David