The guitar Doc is playing in this video (which was shot at MerleFest in Wilkesboro, NC on May 1, 2011) is a Wayne Henderson cutaway style. Wayne makes high quality handmade instruments in VA and is a picker in his own right with a unique style of playing.
For most of Doc’s career he played Gallagher guitars (made in Wartrace, TN). Distinctive sound, handcrafted- American.