Hey Multiple Sigma Owner, you are right! A guitar collector buddy was over and confirmed the solid spruce top on the gcs-6. He owns a Martin 000...same guitar the gcs was meant to emulate. He pointed out the wood grain. Evidently the grain is optimal if it is tighter in the center of the guitar, and should fan out in to wider grain patterns. My Sigma has the desired pattern. A couple of things he noted that separate the Martin from the Sigma were the cheap tuning keys, the lack of scalloped bracing, and the not-so great "rosewood" stain finish on the mahogany body. He said my 35 year old ax has a straighter neck than my 2 year old BR 160. Then, to top things off, I see somebody has a 6 on ebay currently, and they're asking over $400. As indicated earlier, you can ask whatever you want, but clearly the early/mid-70's Sigmas are something special.