Fred,
Generally,
Bucks Co. guns were built with two different sets of hardware. Andrew Verner most often used a faceted butt plate w/o a thumbnail. Shuler et all usually used the classic thumbnail furniture. The top of the butt plate was rounded over with a file detail of usually three lines right where the thumbnail terminates. Reaves Goehring's John Shuler (the elder) hardware is correct. Dave Keck's thumbnail furniture is also correct; however, he eliminated the file detail to allow you to do your own. To further confuse things, I have seen John Shuler guns with the furniture most often attributed to Verner---I have a sneaking suspicion that he probably rode over to Andy's place and said, "Well, Andy haf' you an extra set of hardware, I'm out, and I need to get a gun out?"
As Dave pointed out Bucks Co. guns were gracefull, slim rifles, and share a lot of details with their cousins just north in the Lehigh Valley, but are unique in their own style..
Ron