Just a note to express my thanks and admiration for the amount of effort and even scholarship that has gone into this thread, and for the information I've gleaned from it. I own a Sigma 52SGCS-4, serial number 25569, which I bought (I think) in 1979-80. Like a lot of players, I bought it as a cheap alternative to the higher end models. I played it for a while, but gradually moved on up to other, different and more expensive guitars. I basically abandoned my Sigma and it eventually was picked up by my teenage daughter. She and her friends horsed around with it for a time, but she eventually just stuck with her violin and left it alone. It sat in a corner of her room, uncased, unplayed and unloved for probably five years, essentially gathering dust. Not a case of abuse, exactly, but certainly neglect. When we decided to renovate our house, I retrieved it and decided to spruce it up and try it out. I cleaned it up, oiled the fingerboard, re-strung it and adjusted the action (a slight lift in the strings was the only structural change that had occurred in all that time of inactivity). I was astonished! It sounded beautiful and played with more ease and fluidity than far more expense guitars I had tried in the intervening years. It was like running into an old girlfriend, finding out she was as gorgeous as ever and . . . well, we won't go there. Let's just say I fell in love all over again, discovering qualities and charms I was too unevolved to see before, and now it's my acoustic of choice. Viva Sigma!