I recently purchased an LG-0 and I think it is a 1970 model, but not completely sure, maybe a 69'. Anyway, the case still had the original Gibson handbook that instructs how to change strings, adjust truss rod, etc..! I t also has a tag that indicates it was a Diamond Jubilee. I used a high quality wood cleaner polish, steel wooled the frets, minimally and replaced the strings and adjusted bridge(it has the rosewood adjustable bridge) . The unit sounds amazing. If anyone has any extra info, please shoot me a line! Thanks, Randy