I forgot to mention, one of the most interesting guns I saw wasn't at Purdey, it was in the Wallace collection. It was a nominally circa 1815 flintlock double, but it appeared to be a shotgun with very thin barrels unlike all of the others, which were clearly rifles, many with the octagonal standard barrels I am accustomed to seeing. I have never seen something resembling a bird gun that was manufactured so early in the 1800s. This is the gun:

https://wallacelive.wallacecollecti...p;objectId=61631&viewType=detailView

Here are photos of that gun and other nice flintlocks:

https://imgur.com/a/wallace-flintlocks-3L3g3cw

You can see the bird gun style barrels in the 4th picture.