I agree with JV, that I don’t really see anything british about the lock. I shared lock photos with a major dealer in early european arms in europe who has helped me in the past - he did not find this mark in his proof mark books. He estimated the lock to be of the 1700-1730 period. Maybe the barrel is the same? If I had to guess, I would say maybe the lock and barrel are french, but I really don’t know. The barrel is octagon for about 8 inches then transitions to round. A top flat (not sharp edged) continues to the front sight, but the top of barrel seems to be round in the short section from the front sight to muzzle. The lock and barrel could be american made but I kind of doubt that since the lock has a proof mark. Maybe from a french trade gun,or trade gun parts? I really don’t know. Likely the lock and barrel are older than the gun, as these would likely have been reused parts on this gun.
The nose cap almost has to have been made by the same person who made the cap on CB6 in grinslade. Some of the other CB fowlers in grinslade have similar unusual nose caps but without the distinctive design common on this gun and CB6. See comparison below.
I wish grinslade had included some additional dimensions. It does not come through in the photos but the first thing you notice when picking up the gun is that it is massive in the middle section. The breach of the barrel is 1.25 inches, and the stock from flat to flat is 1.77” in front of the lock and tapers to 2.10” just behind the lock. The wrist excluding the trigger guard is round at 1.58”. I was wondering if these beefy dimensions may be a clue to military stocking, but without similar dimensions on the other CB fowlers in grinslade it is hard to tell.
Another interesting feature is the trigger guard is not exactly straight. The casting with a turn may have been done to account for the really wide stock at the trigger? It looks like a couple of the other CB guns in grinslade share this strange feature.
Does anyone know how the CB fowlers were orignally attributed to the massachusetts / rhode island area? The grinslade ones are unsgned but I assume signed ones are from here? I am not questioning the attribution, just curious if this style also could have been made in philadelphia or elsewhere.