Researcher, what is the story behind the reversed bite on the rear lump? I assume that the locking bolt moves forward when pushing the opening lever to the right? Interesting arrangement of parts.
That was Edward George Parry's patented rear-acting bolt. Parry Fire Arms Co. made a Quality 1 gun that was just bolted with the Greener cross-bolt. From the 1892 SD&G catalog --
Their Quality 2 gun had the rear-acting under-bolt and was offered with Twist, Laminated or Damascus barrels, with higher grades made to order.
I have no faith in that Carder book. – Gardner and Carder -- I'm sad to say that I have little faith in either of these books. Of the two lines I've researched in depth (Tobin Arms Manufacturing Company, and Fox Gun Co. Balto., Md., U.S.A./Baltimore Arms Company) the entries in Gardener vary from misleading to downright wrong, and Carder's entries are just regurgitation of Gardner with no original research.
There is no substitute for original research -- thumb through a few thousand copies of sporting magazines from the period you are interested in, say 1890's to 1920, looking for ads from the company or "Trade Notes" about it; then look thru all the appropriate city directories for listings of the company in question and the officers of the company; check the Patent and Trademark office for relevant patents and any trademark the company may have registered; check State Archives for incorporation information, court proceedings, and census information on the company involved. All a lot easier to do on-line now then when I did it hands on at the Library of Congress, the Patent & Trademark Office, the Maryland Historical Library, New Jersey Historical Library, etc. A good set of books to start in is the
Marvyn Scudder Manual of Extinct and Obsolete Companies. I put more faith in records from the time in question, than what someone "remembers" fifty or more years later.
I find doing the historical research on the companies and individuals involved in designing and manufacturing the objects of our desires a good portion of the fun of messing with old doubles.