So I was fortunate enough to land a 1985 D-15 in great condition from a very nice seller. OHSC and case candy included. The seller said that he bought the guitar new in 85 or 86, and that it had the ornate truss rod cover pictured below when he purchased it. The TRC fits perfectly - not sure how I feel about it aesthetically, but it sure seems like it was made for this guitar. Has anyone ever seen anything similar on a new Guild?