Boss TW-1 T Wah Silver Screw with ACA-120 power

 The T stands for “touch” Wah,  The effect made wildly popular by Edie Brickell‘s guitar player with the 1988 hit “What I Am”. 

 This particular unit is the all elusive silver screw, 2nd variation from the early 80s   There is no serial number inside but check the graphics on top for dating    The ACA-120 power adapter is also included which is a real score because they are hard to find. This is fundamentally different than a PSA power that boss has used for a long time