The "best early 19th century American SxS" would most likely have been a percussion gun since center fire cartridges hadn't been invented yet.

However, if we're really talking about late 19th or early 20th century SxS's, I'm also partial to the early hammerless Lefevers. But I still kick myself for not buying one of the really good American doubles when I had the chance around 1994... an A Grade Harrington & Richardson in very nice condition for $450.00. At the time, I had no idea what I was looking at, and no idea that I'd probably never get another chance like that. Besides, it had those dangerous Damascus barrels that everyone knows are more deadly than a grenade with the pin pulled.

Voting for anti-gun Democrats is dumber than giving treats to a dog that shits on a Persian Rug