Tim--
If you plan to keep the knife, maybe use the process that Grady McCotter used to clean and preserve the sheath.
He wrote it up, and I think it is posted someplace on this forum.
I also could email it to you if you PM me your email address.
I probably would not get the knife cleaned up since it carries honest age patina. That includes leaving the original owner's name on it. At most, maybe just use metal polish on the brass, but that is a personal choice and might not be necessary since I don't see any green verdigris on it.
But if you plan to sell it, maybe just leave everything "as is" and let the next owner decide just how much cleaning he might want to do.
Lucky find.
Larry
_________________________
Larry W. Williams
RKCC #CM-041
ABKA #046
RKS #1246