Well, old Ks, like that one, could be worth huge amounts of money, but cymbal collectors don't like them to be cleaned. The patina adds to the mystery and also the sound of them. Ks are the most valuable of the large cymbal makers. One of the reasons is they have no idea what was used and if the metal was damaged in the process, and they rarely believe anything anyone tells them about the process used. Patina such as that you removed "mellows" the cymbals tones. Most cymbals have completely different sounds with and without patina and it is considered taboo to clean the patina off, by any means.
Just the quirks of the vintage drum world, like re-wrapping an otherwise good kit. If the original wrap is in good condition, and the owner thinks they would look better in green sparkle than that hideous Black Galaxy, that is in otherwise very good condition, the owner just killed the value of those drums. The B/G wrap is one of the most sought after wraps, and is very valuable in good original condition. Same goes for cleaning cymbals, other than with mild soap and water to know of the heavy dust.