Dave:
Well, I thought I had all of Wisker's books on VA rifles BUT I'm wrong 'cause that's one I don't have.
I have "Gunsmiths of Virginia", "Gunsmiths of Virginia", second edition, and "Gunsmiths & Allied Tradesmen of Virginia".
I would think maybe the same rifle would be in one of these as there is a lot of repetition from one to the other. I just did not recall the "Sheetz" rifles with such a sharp crescent at the butt but last night I was looking and low, there were several yet it seems there are more Sheetz styles with not so radical of a crescent. I think I noted 11 makers with the last name of "Sheetz" in one of the books. (Not to mention the probably scores of others that were taught by or worked with or copies the famous "Sheetz style.) Maybe if you can identify the specific Sheetz in you photo I'll see if I can match it to one of the many photos in my books.
But all that aside, it's one nice looker and I'll enjoy seeing it as it progresses!