The 19-2 began shipping sometime in late 1962 or early in 1963. The change authorizing the new cylinder stop and eliminating the cylinder stop plunger screw (resulting in the -2 model variation with a 3-screw frame) was not issued until November 28, 1961 and it took S&W several months to use up the old parts. The -2 model variation is a great shooter with no particular faults in design, but as stated above, it should be used with the 158 grain bullet the majority of the time.
The 19-2 below was shipped in June 1964 and is a good example of a Combat Magnum with a four inch barrel and nickel finish.
Bill