I have a Jones underlever, non-rebounding 12 back action hammer gun SN 2296. The rib reads "Charles Boswell Maker Edmonton London N." The non-rebounding hammers pre-date Stanton rebounding locks. The wedge forend predate the Deeley-Edge forend of 1874. Later guns I have seen used Stanton patent locks and Deeley-Edge patent latches. I place my gun in the early 1870s. It is the earliest Boswell I've seen.
Chris Batha has Boswell records starting about 1899. He should be at the Southern as well.
Hope it helps,
Joe in Charlotte
That was very helpful, mine also has the wedge forend and non-rebounding hammers. That makes my Boswell almost certainly the oldest gun own.
Living in the People's Republic of Connecticut, I'm thinking the Spring Southern is a bit too far for me to attend, especially since I've just spend quite a bit of disposable money picking up 3 British hammer guns in the past 6 weeks or so. No more Internet auctions for me for a while!!!