Thank you, Randall for bringing some nice new material around for us to see. I am leaning toward an Adams County origin for the screw tip horn. Though it has some differences, the overall design and actual execution strongly suggest that origin. Flat butt, large collar and interior threads is pretty much the norm for Adams horns. The second one may be a home made horn and it does have a small framed mirror affixed on the butt. This could be reflective of Lancaster horns which were sometimes made with a mirror in the butt. It is part ornamental and part utilitarian it would seem. My take is that the small horn is home made, or gun smith made to accompany a rifle. Not any way to tell this far down the line I expect. Thanks again.
Dick