Boss dm2 dated to feb 83. MN3205 chip. Back plate has been replaced at some time in its life. Had a power supply issue when I got it which has been professionally repaired and it is fully functional with a 9v power supply or battery. Pots and jacks recently cleaned with deoxit. Some scuffs and scratches on the paint job but sounds amazing. I am only parting with this piece of history because I use the Waza craft version on my board and I have too many pedals that I don’t use. Comes with original box and the bad part that was replaced. Velcro on back. Product comes as is. Will ship well packed and insured to the lower 48 US. Thanks for checking out my listing!