Hello Psittacus, and welcome to the Forum. I believe that you've given us an incomplete serial number. K635** would be from 1948 (I think). However, the K22 that you've shown is either a "3-screw" or "4-screw" which would be from the mid-to-late 1950's. Please check your SN and someone will give you the information that you're looking for. -S2
ETA: The model that you've pictured is called the K22 Masterpiece, and/or the Model 17 if mfg'd after 1956.