I've looked at this lock since it was first posted, was uncomfortable with it then, and am still uncomfortable with it... for several reasons. I would expect a good VA rifle to have a good English lock, and I would expect it to be marked on the front either by maker, or by importer, but there is no name. The area where a name should be present is covered with many light tool marks covering the surface, as seen in image 4 when enlarged. Yet there is a smooth plate surface under the frizen spring area and on the lock's surface area round the edges of the cock. That suggests work has been done on this lock's face. I'd also expect somewhat similar but perhaps sparce engraving on the cock face, and it is plain. Both the small screw head holding the cock on the tumbler, and the jaw screw, look modern to me. I'm also suspicious of the rough end of the bolt attaching the frizen spring... no good original lock would have that rough of a surface. The spring looks OK, but that doesn't mean it was originally on this lock, and I'm pretty sure that roughly cut off bolt wasn't, either.
A particularly questionable detail is the row of small, slightly uneven dots on the lock plate just below the pan. That looks like a more recent addition to me... too rough to be original work, and I've not seen that detail on other locks before. That type stuff is usually present to take the eye away from more recent pan work. The pan appears attached rather than integral, and a little on the clunky side [both pan and bridle] to my eye for an original lock. This lock just doesn't have the surface I'd expect for an original lock, and several of its details raise questions about its originality, at least to me. As to the dating question, these oval tailed plates with no trace of a point on the tail suggest an 1810 or later dating to me. This is one of those locks that some like, and a few don't. It may be all original, but it is suspect in my mind.
Shelby Gallien