Used Boss CE-2 chorus. (**See included screen shot from a Boss Decoder website indicating manufacture date range 1979 thru 1987.**) Use the photos I have included of the PCB notations and serial number to make your own determination. I purchased used around 1999. I used it some but I replaced it with a BOSS Super Chorus because it has a level control which helped during live performances. I have used it some since but not for a long term basis because I mainly do not play that style of music anymore and it needs to go to someone who will use it. It functions great and still sounds like the proper CE-2 that I remember. The LED still works. The battery and ACA adapter connections have been tested and function properly. There are obvious paint chips(see photos from every angle) from its long life of use, and the rubber grommet at the thumb screw catch has hardened but the pedal switch still functions. Please ask any questions before buying. Free Shipping to contiguous US States.