A pretty conventional Birmingham export grade fowler. I imagine thousands of them went west. They aren't too common out there but I think that's because they were used hard and worn out. The lack of British proofs is not terribly important. There was no legal requirement that guns intended for export be proved. Most were, partly because people often expected to see proof marked and also because the barrels were made by specialist makers and likely proved in large batches before they were supplied to the gunmakers. In that case, the barrelomaker would have no idea whether the barrel was for export or domestic sale. However, if a gunmaker ordered a gross or two of barrels and stipulated they were for export he'd save a little money by not having them proved