I don't have the citation for Tobin as a scalp hunter. The information comes from a friend who is a better researcher than I and his take was that Tobin was not all that upright. But he gave not details it came up in a discussion of "My Confession" and the fictionalized "Blood Meridian" that used it as a basis. However, into the 1890s or even later there were people in the west that killed every native American they could. So getting paid for it would have been a plus for some. There are other early J&S "plains" rifles both full and 1/2 stock that are early. At least they share the breech design of the Helena rifle. It is obvious that the Petersen rifle, the Atchinson rifle and this rifle were stocked by the same hand. but we will never really know if they are Jake or Sam rifles. But the stock ourlines seems to have died when same did. If not before. Also the rifle in Helena has intials on the cheekpiece inlay that match those of Edmund Christy. And the rifle has extensive engraving so it was not a run of the mill rifle. It's tantalizing but cannot be traced since Christy died without issue. But the rifle was, according to the Museum staff originally collected in or near St Louis in the 1930s or 40s IIRC. The one with the sliver and mother or pearl is the Atchinson rifle the other the rifle in Helena. The Atchinson has what we call a "patent breech" for the nipple seat. The other the nipple seat was formed on the barrel when it was forged. The accent line on the Helena rifle runs over the wrist and terminates on the lock side of the stock.