Nikon microscope binocular body and 10X eyepieces for the original alphaphot YS microscope, (NOT THE SAME AS THE ALPHAPHOT-2 YS).  This head has been fully serviced by our service department, all glass cleaned, mechanics lubricated and alignment checked. It is in excellent cosmetic condition and perfect optical & mechanical condition.  If you need to replace one, you will not go wrong with this one! Thanks for looking!