This under hammer percussion pistol was manufactured, probably in the mid-late 1800′s, by Bacon & Co. These types of guns where known as “boot pistols”. I don’t know for sure where the name comes from, but would guess these were backup guns that could be stowed away inside your boot – in other words an early sub-compant CCW
For those of you who are interested, its markings are “Bacon & Co. Norwich C-T” and “Cast Steel”.
Thanks to Heath for the photos.