Pictured is what I believe to be a Nikon microscope Hoffman Modulation Contrast condenser. The condition is new, but not in original packaging.  I think this condenser is for an upright compound microscope of the 160 mm tube length variety. The condenser has an n.a. of 1.25  and a working distance of 1.5mm. Present are three modulation plates: 10, 20, and 40 and a brightfield position with a fully functional substage diaphragm. All of the modulators move in the mount for easy alignment. The serial number is: 0022842. All optics ae in pristine condition. Thanks for looking.