No mold inside the lens. There is some small dust and debris inside. The helicoid rotates. The aperture opens and closes. * The aperture ring is a bit stiff to turn. Front and rear caps are not included. For M42 screw mount. The exterior has a used feel, with scratches and paint剥がれ (peeling). I have included many images of the lens exterior, so please check the condition. Everything in the photos is included.