Hi Scott - I myself find that barrel extremely interesting (I have no affiliation with the item or auction). The mass of the barrel, large caliber (still with rifling), and what appears to be an apparently huge amount of swamp at the muzzle may be an indication of a very early barrel. The gun looks like circa 1840? but the barrel and inscription look like they could be genuine to me. Rather fresh looking, but then again the barrel itself looks almost pristine. thanks for posting. It is believable to me that a very early barrel could have been out to use in the 1800's if in great condition.
Another possibility - rev war guns that Henry may have marked if he was the seller of contract weapons, even if he was not the maker?