I bought an1847 Nippes flintlock It is a very clean gun with great marks. I know that most of these were obsolete when then left the factory and were-converted for percussion service almost immediately. I also know they were a popular gun to re-convert. There was one screw on the pan that was suspect but other than that screw, everything on the exterior looks ok. The fit of the pan is a bit off but in researching pictures of "correct guns" I've seen similar fit. I have also seen frizzen springs that are short like mine and ones that wrap around the pan. The jaws of the hammer are stippled and have been in the leather a long time. When I took the lock out, the questionable screws hole has been filled and tapped, another bad sign. The last notch on the tumbler has been repaired. Take a look at the pictures and share your expertise.