well first off i would try eather the TMA "TRADITIONAL MUZZLELOADING ASSOCIATION "
or THE AMERICIAN LONG RIFLE ASSOCIATION .
both organizations have well known colectors and smiths from both sides of the pond that will most like give you information you can take to the bank .
tell then , post your photos . we should be able to ID most of them for you .
you shoold find a caliber mark , a proffing mark and a proventual mark . you may even find an importer mark and a makers mark if your real lucky