Thanks for the wealth of background information.
There are only 3 marks on bottom of one barrel. Two look to my uneducated eye as British proof marks. I don't know what to make of the Z or N. Does this help date the gun?
The barrels are about 27" long depending on if you measure from the barrel hook face or the end plugs or depth of bores. They show no signs of being cut. The barrels touch at muzzle. The tiny bead is about 1" back from muzzle. There is no indication the barrels are Damascus or any kind of twist. They look to be fluid steel. Could this gun have been made this late to have steel barrels?
