The markings and words on the guns tell the story. You may need a VERY strong light and a magnifier on older guns.
The last, ornate flintlock is a modern, italian repro.
When looking at muzzleloaders, couple of things to consider-
The originals were deringers. Imitators were derringers. 2 R's.
Anything that says "BLACK POWDER ONLY", well, at the time of the original, that was all there was- gun would not be so marked.
DIKAR or JUKAR mark on barrel indicates a made in Spain modern repro. Used on a lot of CVA firearms.