Hi Dave,Looks very much like the ones I've seen a lot from Tennessee Valley Muzzleloading years ago. Looks like an L&R lock. TVM tends to leave more wood along the bottom edge of the lock mortise and uses a bridled pan these days. It could also be a Sitting Fox fusil. They still seem to be using the unsupported frizzen L&R lock on their Fusil de Chase.
LD
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