This is the ONLY page on Google to come up from my search for Sigma 52SRD-9. I have had serial number 18239 since 1978 when I bought it from a high school buddy (I think he bought it new, or maybe used.)

In the 80's had passive pickups put it (Martin brand) and played it to lead music for youth groups on and off. Now, 26 years or so later, I upgraded the pickups. I think its sound compares to ANYTHING I have heard amped.

This model has the sideways "M" or "sigma" in pearl above the gold block letters as have been described earlier. This is a solid top for sure, and I am about 90% sure the three-piece back is also sold (I can see the grain through the sound hole that I believe matches that of the back (rosewood).

This is a flat-picker, finger-picker's dream guitar!

Oh, not for sale. Just thought I'd see if anyone knew actual year info--I KNOW it is over 29 years old, since I have had it that long.