Leitz Wetzlar Ortholux-Pol BK and MK.  Polarizing Microscope with Universal Modular Extension Facilities.  Contents include functions and options available including various objective carriers, photo tubes, illuminators, condensers, objectives, eyepieces and stages, including the infamous universal rotating stage.  Manual is 16 pages of information and illustrations in color and black & white.  Published by Ernst Leitz GMBH subsidiary in Canada.  Appears to be 1975 vintage.   Item# L0204.