Teisco checkmate 88 amplifier This was my grandfathers amp in the sixties or seventies. He bought it used. Everything is original and in good working condition. Category: Music and Music InstrumentsCondition: ExcellentDate Period: 1960sFor Sale?: Yes Know something about this item?Log In and Add New CommentIf you don't have InstAppraisal accountclick here to create one for free!