I know this is a late post but I happened to be cleaning out some clutter in the basement and found a Sams dulcimer I bought back in 1971 or 1972 when I was at St. Andrews College in Laurinburg, NC. Johnny, when you said that your dad sold most of his instruments through the co-op up near Boone, it reminded me that I had actually bought this instrument directly from him at St. Andrews. Your dad and a number of instrument makers, singers, cloggers, etc came to attend the first St. Andrews Folk Festival. Charles Joyner, a history professor and folklore buff at the college, put this event together. Many of these folks he had met while doing his research in mountain folklore studies.
I bought the 3 string dulcimer and a display stand for $50.00 (huge money for me at that time!) in the St Andrews Gymnasium where the tables and soundstages were set up. I remember that he was so tickled that these young college students were really interested in mountain music. I don't recall how many other folks might have bought one out of his hands but I know of several who placed orders with him.