Very gently used 1980's black label with serial on inside of battery compartment. Hard to find a cleaner example! These sound better than the ones after they went to the silver label.  I have never owned one of the newer boutique distortion pedals as I still think the Boss black label era DS-1 is the best ever!  These versions had the Toshiba TA7136AP op-amp chip as seen in pictures- which is the tone these are known for-unlike the later ones when they changed chips every few years. This unit is very clean inside and out with no boogering around inside.  It's a clean machine!