Just picked up a Model 48-2, 6 inch blue. Nice gun, good finish, looks like it wan't fired much. Grips are nice, but not diamond - probably swapped in the past, oh well. According to the S&W Catalog, all info about serial #'s mentions K and a number - production began at K348746. This gun is 6K3XXX. Is this typical? There is an assembly number on the yoke and frame (matching). Looks like a nice 3 screw shooter, hope to try it next week