Like others, this is about the only thread I have seen dealing with Sigma's. I recently was given a Sigma SDR-28, made in Korea. I would like to find out more about it. the only information I have found suggests that it was made sometime between 1987-1991. There is a "C" stamped on the back brace. Someone suggested in this thread that it might stand for cutaway, but mine is not a cutaway. It appears to have a solid top. If it isn't, someone did a fine job of matching the pieces. I has the Sigma Guitars inlayed with mop and a gold colored est 1970 underneith it. I haven't seen anything in this thread that mentions the "S" before the DR-28. Any information would be appreciated.   

My e-mail address is davesg@verizon.net