Cuetek--
The preferences of RMK collectors seem to always lean toward leaving vintage knives in their "found" condition--especially if you want to sell it to someone else.
When you try to sell a knife, of course the potential buyer will try to use any observed "problems" with the as-found condition as a bargaining point to try and get it at a lower price. This bargaining process varies depending on the individual buyer and just how competitive the market might be for whatever you are offering for sale. It is a process that goes on in any buy-and-sell field.
However, as others have noted here, it is generally OK to put something on the knife and its components to simply protect it from the elements. There are varying opinions on how to best "preserve" the blade, the leather on the handle, and the sheaths. Note I used the work "preserve" and not the word "restore."
I have collected antique Sheffield knives for some time. I knew one collector, now deceased, who would sit at club meetings and auctions with his polishing cloth and a stick of rouge rubbing away like mad on the genuinely age-tarnished blades that were maybe 100 to 150 years old--and he pretended that he could attain the unachievable and put a polish on the blades that came anywhere near the appearance of what the Sheffield craftsmen had put on them originally. Nor could he eliminate any of the natural pitting that might have been in the blades--other than by removing enough metal from the blade to bring the surface down to the bottom of the deepest pits. All he succeeded in doing was to put a "Kentucky shine" on knives that I would not then buy from him or trade anything to get them back if he had gotten them from me in some transaction.
However, long-winded as this has become--whether you want to keep these knives for yourself and perhaps your progeny, or you want to sell them, you can get good advice from Tunefink and others if you are able to let them see the knives in person.
These are nice "finds" (I say "finds" because you had them all along), and they do have provenance via the etched names and the family tree.
Enjoy.
Larry
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Larry W. Williams
RKCC #CM-041
ABKA #046
RKS #1246