I have what I believe is a K-22 I bought from a coworker. Her father registered the gun along with a K-38 with a similar serial number on Guantanamo Bay, Cuba Marine Base in January of 1954. Serial number on the 22 is K198787, 4" barrel, hand ejector 5 screw (I believe one is behind the grips?) with strain screw and adjustable sights. The K-38 was purchased on 12/30/1953 with a serial number K198900. Any help in dating this gun would be appreciated. I apologize for the poor quality photos. Regards, Ed