A rare beast indeed from the catalog of pedal titans, Boss!
Manufactured between 1979 and 1982, the SG-1 has become one of the most desirable and hardest to find Boss pedals. Best way to describe the sound is as if you had a pedal that replicated the volume swells you do on your guitar with your volume control.
Cosmetic condition is good for its age with small amounts of enclosure wear present. Hardware and electronics are fully functional. No box included.
