Made in 1983, this is not the first issue of the DS-1, which had silver screws, a silver thumb-screw to open the battery compartment, and a longer dash in between the 'S' and the '1', putting the 'D' underneath the 't' in Distortion, instead of the 'i'. This one has black screws, a black label, and a black thumb-screw. However, this version of the pedal uses the same Toshiba TA7136AP op-amp as the earlier versions, and, besides the appearance, is identical to the silver screw version.
So far, I've only had a chance to try this baby on a little 1-watt Fender Mini Deluxe, but I figure if it sounds good running through that (and it does, believe me!), it should sound awesome when I plug it into a real amplifier. I can't wait!