I picked up a lightly used S&W 67-3 yesterday and have a couple questions for the resident Smith experts. The revolver is neat as a pin, no endshake, slight drag on a .004 feeler gauge, a couple light machine marks in the forcing cone. Fit and finish is clean and sharp. It appears the previous owner replaced the cylinder latch with a new model MIM latch button, more "racey" I guess and the hammer and trigger are not stainless but case hardened. I am just guessing that these were shipped with Stainless parts. I kinda like the contrast so thats fine with me. Also along with the hole in the top strap used to secure the rear sight, there are 2 additional holes drilled and tapped in line with the sight screw hole about .75 inch apart extending rearward. Are these extra holes done at the factory or did someone do it to maybe mount some type of aftermarket sight? Anyone know the production dates for the 67-3 guns? Dang thats a lot. Thanks