This is a used CDI unit from a 1980-81 Yamaha XS400.  May fit other years and models.  This is an original part made by Yamaha and not a reproduction.  CDI box has some fading and the plastic connector is crumbling.  Please look at photos for condition.  Came out of an old motorcycle shop that was closing down after 45 years.  Great part for your vintage Yamaha.  Please email if you have any questions.