Nickel K22s are very, very rare, IF they are original factory shipped nickel K22s. A quick check is to pull the grips and look for a letter N stamped on the grip Frame, with or without a rectangle or sqaure outline around the N stamp. If it's not there, it could still be an original nickel shipped gun, but only a factory letter can verify that. If you see an RN stamp, that means a refinish to nickel, and it could have been originally shipped as a nickel gun but is a refinish, as a blue gun was taken from inventory & nickel applied to fill a dealer order when no nickel guns were in inventory.