I've been to the site badboy recommends. While extensive, it doesn't list every model Sigma produced (see my Feb, post regarding my GCS-6). The site, which I believe is provided by Steve's Music, will refer you to Orion Blue Book, which, for $4.00 will indicated the estimated value of your guitar. I found the same source at my local library some years ago...and again, the GCS-6, was not listed. So what do I believe the value of my old Sigma to be? To most, because I bought a hard shell case some time ago, someone might give me the $135 I paid in 1975 or 76. As evidenced by this site, to many, our old Sigma's value is that of an old friend that will get played once a week because we have a relationship. Is it the best guitar in my house? Of course not. Is it my most valued. Without doubt.
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