Howdy
Yup, the SCSW is the 'Bible' for S&W enthusiasts.
"Model 67: The .38 Combat Masterpiece Stainless.
Caliber .38 S&W Special. Double-action revolver built on the square butt K target frame with three screws. Stainless steel version of the Model 15; 4" barrel with pin and top rib, 6-shot fluted cylinder with a nominal length of 1.56", red ramp front sight on ramp base with stainless steel adjustable micrometer click rear sight, later changed to a black rear sight. Walnut Magna style stocks with S&W medallions, non shrouded extractor, 10-groove serrated backstrap and forestrap, .375" semit-target hammer, .312" smooth combat trigger. Produced c. 1972 - date.
Engineering and Production Changes
67 (1972): Introduction
67-1 (1977) Change to move gas ring from yoke to cylinder.
1982: Delete pinned barrel.
67-2 (1988) New yoke retention system/radius stud package/floating hand/hammer nose bushing.
67-3 (1993) Change extractor, drill and tap frame, introduce Hogue grips, change rear sight leaf.
1996: Delete square butt/begin shipments in blue plastic case.
1997: Change thumbpiece/ship with Master trigger locks/change to MIM trigger.
67-4 (1998) Change in frame design to eliminate cylinder stop stud/eliminate serrated tangs/change to MIM hammer with floating firing pin/change internal lockwork.
2001: Fired case.
67-5 (2002) Introduce internal lock system.
67-6 (2004) New two piece barrel design."
This is from my 3rd Edition of the SCSW, published in 2006.
Waiting for the 4th edition which should be out soon.