Great family history and interesting piece. Muzzleloaders are another great passion of mine. I have not seen too many (or any)  fowlers with this combination of features. Smoothbore, hooked patent breech, back-action lock, and three captured barrel wedges for a relatively short barrel. Nice stout piece. I have used a 62 caliber flintlock fowler to take a deer a few years back. It is a great caliber and you can hunt anything in North America with it from small game to large game. Well, not suggested for grizzlies, but not impossible if you got the....gumption for it.