I bought a Sigma DM3 while in the Air Force in Alaska in 1979. This Sigma has the Sigma Guitars Est 1970 on the head and the paper label inside. Also this guitar was made in Korea. I have not seen any info on the DM3 of this era and also I keep hearing that Sigma was not made in Korea at this time, now I am looking for info on this model and an estimated value. Also I have played with people who had Gibson and Taylor Guitars and they loved the action and sound of my Sigma. Love my box...