Leitz 100X UV Glycerine immersion  Microscope Objective that fits the Leitz series of  160mm TL microscopes.  The numerical aperture is (n.a.) 1.20 and it requires a quartz coverslip with a 0.35mm thickness.  I think this objective was intended to be used on a heated stage in the fluorescence mode. This objective should work very well with other microscope makers from Nikon, Olympus and Zeiss as long as they are a 160mm TL version.  All glass is free from fungus, dust, scratches, element separation, or oil fouling of internal lenses. The image is very pristine, optically  just like new. This objective is very rare and even rarer to find one in this condition.  Thanks for looking!