I was admiring a Combat Magnum (19-3) circa 1970 mfg. at the range today which was purchased by one of our younger members. The model number marking in the yoke cut caught my attention because I initially thought it was marked as a Mod. 18-3. If I'm not mistaken, I believe this frame was initially stamped as a Model 18-3 and at some point during the assembly the 8 was over stamped with a 9 and the revolver was built as a .357 Magnum. In the bright sunlight with my new reading glasses, I think I see a slight difference where the tail of the 9 fades into the bottom of the 8. I have attached a photo and would be interested if you agree or perhaps have another thought.