I found a Sigma Guitar EST 1970 made in Korea model CS3 SK 087031 than inside a stamped on the neck 700187 in our closet. My husband bought it mid seventies [he thinks 1976 or 1977] and being a lefty found it very hard to play so this guitar is in great condition. It has sat in his closet for all these years in it's case. The wood and condition is beauitful, it has six strings and have no idea of a value, he says that he has maybe less than five hours of trying to self teach. He has never learn to play and our nine year old wants to learn but don't want him to ruin it, if it has any value to it.
Can anyone give me some advice?