Can anyone ID this frame? I know it's a long shot but WTH. I talked my dad in to buying this thing 30-35 years ago from a neighbor. It has not changed except for the Hogue grip. It has a Bomar rear sight and a taller than normal front sight. The front of the frame is stippled and it has an overtravel screw in the trigger. The frame has no markings other than the 4-digit number you see, which is also on the ejector. Frame-to-slide is not very tight but it still shoots good.