Lisa,
Seaton Haden enlisted at S. W. Davis's Shop. This was located in the Jack's Creek area of what is now Woolwine, Patrick County,VA. I have not searched enough yet to find the exact location of the site. I live near there but haven't found anything.
FYI the other 51st company (Co. D) from Patrick mustered in at Ross Bottoms which is on Hwy 57 between Elamsville and Buffalo Ridge.
Bob