Sigma DM-5 six string guitar. Truss Rod accessible via soundhole. On board equalizer with pre-amp which I believe were added some years after manufacture and seems to be missing the lid to the battery compartment; doubt it works now. Has some nicks, dings and finish cracks. Built in Japan for C. F. Martin Company. I gave it a good cleaning and strung it with a set of D'Addario strings. I added new Martin string pins and end pin. She sounds great, but, I think the truss rod and set-up may need adjusted (string height/action) doesn't seem to be much wear on frets. $200.00.