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Nikon Plan Apochromat 4X microscope objective 160mm TL with an NA of 0.16 and a working distance of 4.73mm.  It does not require the use of a cover slip.  The Nikon number is 78744.  The glass is in excellent condition with no dust, fungus, scratches or element separations.  The cosmetic condition of the case is good and shows average wear.

This objective will fit the Nikon Labophot, Optiphot and Microphot series of 160mm microscopes.  It also works exceedingly well on other 160mm TL microscopes from Zeiss, Leitz, Olympus, etc.