This 1979 ProCo The Rat Version 1-D Distortion Pedal is in Good Vintage Condition with normal wear and tear for a pedal of this era.  Fully functional. Serial Number RT-021878.  Distortion, Volume, and Tone controls.  Made in U.S.A. 

The RAT's tone and design made it a staple for countless artists across genres, and the 1979 version is especially prized for its raw, unrefined sound and higher build quality.  A cool piece of sonic history that's as relevant today as when it was made.  

See photos below for more details.