LEITZ LEICA ‘DARK FIELD?’ CONDENSER W/ HOLDER & APERTURE FOR ANTIQUE MICROSCOPE

Width of the aperture 48mm, inner diameter is 28.5mm. Thread size diameter 30mm. Aperture can be screwed in the back of the condensor barrel.Condensor holder max width 56mm, screw thread is 32mm. Nickel plated outer diameter is 39.5mm, inner diameter is 37mm.
All parts are in good condition. Show some signs of prior use. It shows no dings, no dents, minor scuff marks, minor superficial scratches. Shows some handling wear. The condensor element is in good condition. No cleaning marks, no scratches, no haze, no fungus, no separation at the glass. Shows some scuffing at the attachment side. Aperture works and is in good condition. Rotates smoothly. Some wear at the aperture blades. Comes in original Leitz case.