The gun in question is a single-bite, underlever snap-action and serial numbered 6184. The rib is engraved, "P. Webley & Son, St. James, London," but it is so faint that photos are not possible. The locks employ Stanton's 1867 #367 patent. The proof marks are Birmingham. The forearm is retained with a key. My guess as to the early 1870s for a date of manufacture is made primarily on the basis of the action and the forearm.