This is an Ai Micro-Nikkor 105mm F4. There is no mold on the lens itself, but some fine dust can be seen. The focusing ring is a bit stiff, but it's at a level that doesn't interfere with use. It's a fun lens that can be used from close-up to infinity. Lens cap and rear cap are also included. Focal length...151-200mm Focal length...71-150mm Open F value...2.9-4 Other features...Old lens, with front lens cap, with rear lens cap