100% Spanish, from the area around Castille based on the stock shape. Miquelets of Catalan origin have different stock shapes, with a skinny buttstock that has sort of an extended toe. Just google "miguelet musket pictures" or similar and you will see all the interesting variants of these types of guns. This was the preferred lock by the Spanish, especially in colonial areas as they are easier to maintain and have fewer parts than a standard box lock. Washington was supplied with thousands of these by the Spanish during the Revolution, and these were likely the type of guns carried by many of George Rogers Clark's men when he took Vincennes as he had been resupplied by the Spanish in St. Louis. They made these locks for their military pistols up until the advent of repeaters as percussions. Many of these pistols were brought to the states during our Civil War as European countries emptied out their armories of obsolete guns to less than knowledgeable arms buyers. Not impossible this gun came here that way, especially if it has Charleston provenance. As several have pointed out, it is obviously a percussion from flint conversion. Sadly, originals unless they are high end collectables, are in demand by "Pirate" reenactors (read drunken street partyers) because they tend to be cheap, most gun shops don't seem interested, they are not rare in Florida in pawn shops.
