I know I'm like a broken record on this--but I still think it is possible that it is this liberty head/Indian head that is being referred to in this 1772 advertisement in the Pennsylvania Gazette, which mentioned a gun "with a curled walnut stock, sliding loops, mounted with brass, the foresight and thumbpiece silver, the maker name John Newcomer, engraven upon the hind part of the barrel, near the figure of a manhead, and J. Newcomer engraven on the lock."
I don't read this as if the "figure of the manhead" is on the barrel but rather that the "figure of the manhead" is "near" the "hind part of the barrel" (so, behind the barrel).
Eric, you've suggested in the past that "the 'figure of a manhead' could be many things." Is there something that we can see on a surviving gun, other than the liberty head/Indian head, that could be a "manhead"?
The other issue is that Newcomer is in Lancaster County and the liberty head/Indian head is in Lehigh County and now eastern Berks County. Is it possible that some unsigned guns with the liberty head/Indian head have been attributed to Lehigh County precisely because of the liberty head/Indian head--but that, if we did not assume that design appeared only in Lehigh County, could be from elsewhere?
I don't mean to hijack the thread about Rupp, but it's been a pretty wide-ranging thread already! My only point is that, to believe that it began with a club in Allentown, one really needs to be sure that the "liberty head/Indian head" design does not appear elsewhere.