Was one of these 1844 locks sold last year on Schofield auction website? Was it the lock on the front cover. For your information this lock was pick by Hobbs on at least one occasion leading to the introduction of the false gates on “b” and “g”.
Also I think sector lever l was there as the bolt had no internal support only the case of the lock. I’d like to see an example of this lock if anyone has one. I can’t find the picture of Schofields auction catalogue if anyone has one. It could be a missing link in Newell’s lock.