The top lock is English, late 18th or (more probably) early 19th century. Its not a "London" quality lock and almost certainly came from B'ham. It is, however, one of the medium quality B'ham locks, suitable to an American long rifle. The best B'ham locks are indistinguishable from London locks... arguably B'ham is where most of the best London locks were actually made by 1790. The "low quality" B'ham locks rarely have bridles on the tumbler or frizzen and are almost always seen on fowlers and pistols, very rarely (if ever) on rifles. My own feeling is (and this is what I call "informed conjecture") because rifles were significantly more expensive than fowlers, rifle makers were loath to put a really cheap lock on one. It may also be that the general customer for a rifle knew the difference and wouldn't likely accept a cheap lock.
Joe Puleo