Without photos, it's hard to say what you have. Before shooting though, if you intend to, remove the barrel and check the breech plug to make sure it is a threaded breech plug. In the 60's, there was one company putting out pistols (flintlocks) that were using an unthreaded, smooth tapered breech plug that was cross pinned in the barrel. A pistol with that type of breech plug should never be fired . . . a nice "wall hanger" but not an operating flintlock to shoot.
If you can post some photos, it would be a great help. Not all kits and kit guns have markings. If it is something that someone made up, it could very well not have any markings on it.
If a pair of '51 Navies were good enough for Billy Hickok, then a single Navy on my right hip is good enough for me . . . besides . . . I'm probably only half as good as he was anyways. Hiram's Rangers Badge #63