Sigma By Martin TB-1B Black Single Cutaway Concert Acoustic ElectricA Sigma By Martin TB 1B Black Single Cutaway Concert Acoustic Electric in Very Good condition! At Evolution Music, we attempt to highlight cosmetic defects (if any) by picturing every angle of every piece of gear so you know exactly what you are getting. We always picture any and all accessories too. What you see is what you will get so please check out the pictures! Everything we sell has been tested and is fully functional unless otherwise noted. We