Hi , I have a c50 , bought it for $50 at a fleamarket serial#911403 last number unreadable . I'm a luthier and I bought it immediately Brazillian rosewood back and sides , cedar top , ebony fingerboard . It plays swweeter than anything I've built and a lot of other high end classicals as well, ramirez etc. . Other than this post I found an article that showed one auctioned in England for 15000 sterling. You are all very fortunate to have this remarkable instrument . I don't think this is the same as the one sent to you by Gibson , certainly not Brazillian rosewood at that time and that price. rcanavan2@verizon.net