Good catch, Flintlock1640! That is a very interesting piece, and I'm sure all of us appreciate your sharing it with us!
I would lean toward a more southern origin for this gun, based primarily on the shape and drop in the buttstock. That little square lock bolt washer, I believe, is also kind of a southern thing.
The lock may very well have been flint originally, but I would suggest the gun was possibly built as a percussion. Flintlocks typically (but not always) use two lock bolts, and this gun only has one. Also, the buttplate looks, to me, to be a later style. I don't doubt the lock was originally flint. The hammer has a handmade look.
The striping on the stock looks artificial to me, but that doesn't detract from the gun at all. The technique of applying a reagent to plain wood to simulate the "tiger stripe" of highly figured curly maple is an old and honorable tradition among muzzleloading gunmakers.
I'll be interested in reading what others have to say about this interesting old gun.
You made a good purchase!
Notchy Bob