Vintage BOSS SD-1 (October 1981) Black Label
This is a Used, Classic BOSS SD-1 Super OverDrive pedal, Made in Japan with a manufacture date of October 1981. It has the highly-desired (and hard to find) classic NEC C4558C chip.
It's in good condition, especially for its age - a few chips in the enamel only add to its vintage appeal.
It has been inspected and tested for functionality.