This is as close to a generic gun as one can come. Various scholars may attribute, but the raw fact is that you will never know. I have seen western PA, Ohio, and other midwestern guns with variations of the patchbox. Note that the architecture may have roots in eastern PA, but tradesmen moved with alacrity from that region, spreading out all over the Midwest. You can rule out some areas, e.g. NY, New England, VA & South, but that leaves a powerful lot of territory let alone a more specific area, let alone an individual gunsmith. This is why signed guns bring substantially more than unsigned guns, especially as we enter the generic period, after the Golden Age. Sure, many Golden Age guns are unsigned, even unattributed, but it is the individuality and distinctiveness of their high quality workmanship and enormous artistic merit that carries them into the high roller brackets. Earlier guns bring more simply because of probable history, their contributions to the development of this uniquely American arm, developing architecture, and of course age and scarcity. Fast forward to c.1850 and these elements fast disappear and what is left are generic guns with features more or less [usually less] like the great guns.