I have a lead on a pre-27 357 magnum with serial number s 1019xx. It has a 3.5 inch barrel, 5 screw. When I took the grips off I noticed the bottom of the grip frame was cut at an angle yet blued. The grips are not factory. Were the frames cut like this from the factory? I can post pics if someone can please walk we though the process. Any idea on production date. Thank you in advance!