I WOULD PERSONALY LEAVE IT PRETTY MUCH AS IS. I WOULD CLEAN ANY ACTIVE RUST (BROWNISH, THE BLACK RUST IS GENERALLY STABELIZED) YOU CAN USE A NEEDLE OR DENTAL PICK FOR THIS. THERE IS ALSO A TYPE OF STEEL PAD THAT REMOVES LOOSE RUST WITHOUT TAKEING OFF THE PATINA.THE ONE I HAVE IS CALLED A FRONTIER METAL CLEANER, NORMALLY USED TO REMOVE RUST FROM GUNS WITHOUT REMOVING THE BLUEING, YOU CAN FIND THEM AT GUN SHOPS OR GUN SHOWS. REMOVE ANY DIRT AND COVER IT WITH RENASANCE WAX OR LIGHT OIL. THE SILVER APPEARS TO BE OF LOW GRADE AND WOULDN'T BENIFIT FROM CLEANING. PERHAPS SOMEONE COULD RECOMEND SOMEONE WHO COULD MAKE A SCABBARD USING THE PIECE YOU HAVE AND MEASUREMENTS OR A TRACED DRAWING OF THE KNIFE BLADE. A NICE DAGGER DOUBLY SO AS IT WAS A GIFT AND HAS ACTUALY BEEN USED. GOOD LUCK
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