Just bought a Sigma DM 1 today for my 11 year old and 16 year to learn on. Paid 75.00 bucks came w/case and new strings. Can not make out any serial number. Previous owner says he bought it ten to fifteen years ago. Inside label says made in Korea. How did I do? Sounds like I bought the bottom of the barrel (I was excited because I knew Sigma was an off shoot of Martin). I am bummed though because the first string is buzzing really bad - so right off the bat I've got to have it looked at. Give me feedback please, good/bad/ugly all appreciated!

Karen