This is a genuine Eimac chimney for the 4-400A tetrode.  Includes the set of four mounting clips which both hold the chimney in place properly spaced from the tube, and also ground the metal base of the 4-400A.  Most of the Eimac name on this one is missing and the glass is a little rough around the top and at the bottom, but this has no effect on proper performance.  Full proceeds from this sale will go to charity - thanks!