This is a very nice Smith & Wesson Model 17-4 .22lr revolver. This gun was originally produced as the K-22 Masterpiece. This a 6 shot revolver. It’s a popular model because of th K in the serial number. Has Walnut Magna grips with medallions on each side. Still has a pinned 6” barrel that was later changed in 1982. Bluing is at least 95% with minor removal of bluing in cylinder from normal use. Has original box. Nice piece to have.