I should mention that the transformed Blanch is a single-bite action of the early Lang type, with the rising stud on the action bar, possibly dating to the early days of Blanch pin-fires. As better actions were becoming available after 1862, I can’t imagine that type of action was being made much longer after that. The juxtaposition of that action with the central-fire strikers and hammers is an odd mix! I’ll post a picture of it.