I recently bought what was advertised as a 1964 Marlin 39A Golden for almost $600. When I was sixteen-years-old, the '64 was my first brand new rifle that I bought. I loved that gun. Four years later, while in the Navy, it and other guns got "sold" from my home while I was at sea for months. For the last few years I looked for one to replace it. I bought this from a gun forum member based on his description. When I got the gun I noticed the lever was loose as was the fore stock. Upon breaking it down, it appeared someone had put a newer (shorter)lever screw in place. I ordered a new one and decided to give it to my gunsmith for tightening and gong over. He got a bad feeling as soon as he broke it down. The hammer will cock and actually stick all the way to the back and it looks like someone might have built this "original Golden 39A" out of parts. The photo attached is of what I'll call the bottom front of the upper receiver. I know next to nothing about 39's other than the one I owned many years ago and my smith isn't an expert but he thinks he has seen ones where there is usually a serial number stamped on the area (circled in blue) to match the one under the tang. You'll notice in this photo that it looks like this area has been gone over with a power tool and you can feel something with your fingers. Also, should this model have a golden trigger? This one does not. It feeds fine and goes bang. However, the wrong lever screw and what looks like some other refinishing and overall looseness makes us wonder if this is an original 1964 Marlin 39A Golden (as advertised) or a Frankengun. My main questions are "Should a '64 model have a golden trigger if it is advertised as a Golden 39? Is the serial number stamped in more than one place on the gun so we can validate all original parts? And, should there be a serial number or something in the area circled in blue?" Again, I am including a photo of one area circled in blue, where someone definitely removed metal. Why it was removed is still up in the air. My gunsmith will try and reveal what what there - if anything. If it helps, the bullseye is there as well as two swivel points. Thanks for you help.