Carl Zeiss Jena MC Flektogon 20mm f2.8 ⚪︎ M42 mount ⚪︎ Made in the German Democratic Republic (East Germany) [Appearance] The appearance shows very little use, and I think it's a very beautiful item for an old lens. There are no noticeable scratches or scuffs, and no dents. [Lens Condition] The lens surfaces, both the front and rear elements, are very clean with no scratches or scuffs. There is only a small amount of dust and debris inside the lens, and it is very clean with no mold, clouding, or balsam separation. [Operation] The focus ring rotates smoothly without any sticking. The aperture ring also operates smoothly. The aperture blades are clean and open and close smoothly. Each function operates without any problems and is in good working order.