The picture is of the actual Deringer that Booth used to kill President Lincoln. I think you have some original parts, but I think the stock was made by an amateur.
Note the parrot beak grips in the above photo, and compare that stock to what you have. In your photo, I also see some gaps in the wood to metal fit. I don't
think it's a conversion from flint to cap lock, mostly I've never seen a back action flint lock. There has to be a frizzen spring on the front part of the lock plate if it
is a flint lock. Interesting side note. I built a Lincoln Deringer from a kit one time. When it was done I loaded it with something like thirty grains of 3F under a patched
lead ball. I got back about 6 feet and fired it at a 55 gal. drum I was using for a burn barrel. I aimed at near the top of the barrel, and the ball dropped nearly 3 feet
in six feet. Put a heck of a dent in the barrel, but did not punch a hole. So the movie scenes you see where the card player shoots his deringer through the table is
pretty much Hollywood hokey pokey.
