BOSS CS-1 Compression Sustainer 1980 Vintage  Guitar pedal Made In Japan ACA 

Description

This Boss CS-1 Compression Sustainer was manufactured in February 1980 according to the Boss Pedal Serial Decoder. And it is Made in Japan. It was made in silver screw era.
Note: The battery cable is broken. It works with power suplly only.  The sound is very good.  It was manufactured over 40 years ago and still works fine. 
We have confirmed the sound output with ACA100 power suplly.
The stamped serial number is 9100.