Olympus UApo/340 20x/0.75 Microscope Objective Lens UAPO20X3/340

  
Olympus UApo/340 20x / 0.75 Microscope Objective. The object is in fair condition with signs of wear and use. Looking through the object there appears to be a flaw in the lens as there is a dark line at one side of the lens. I attempted to photograph the flaw, (please refer to photos).