I own a 1937 OP. I originally bought it, knowing nothing of the model, because it was a cheap Colt. As in, 300.00 and some change for in very nice shape. What I appreciate is that I "discovered" some things that are known to other OP owners. I figured out that it is basically a Python (I have one of those, too.) What exquisite timing! I noticed the incredible machining that went into it. The flat surfaces on the frame are FLAT! As in a geometric plane flat. I started comparing all my guns one day in a bright, penetrating sunlight. That kind of light really shows up defects in blued finishes. The winner out of all my guns? Yup.