Wow, what a good place for info on Sigma guitars. Last year I purchased a used SDR-28. The top looks to be solid and I assume the "S" in SDR stands for solid top. I did change out the saddle to a tusq and lowered the action. I'm using light gauge Elixer coated strings on it. What a player. Intonation is closer than what I've heard on guitars costing much more. I've compared it to a couple of Martins, thus I think I've ended my quest for a high end Martin. This guitar has exceptional tone and has aged well. I can't make out the engraving inside as to it's origin. If I was to go home tonight (at work now) and post the serial no. would this possibly provide me with origin and year?

Thanks In Advance