Film Tamron LD 70-300mm 1:4-5.6 Tele-Macro Lens for Nikon AF

Tamron LD 70-300mm 1:4-5.6 tele-macro lens. It's designed for Nikon AF cameras. Includes lens cap and case. There is a spec of dust or what looks like insulation on the inside not sure? It doesn't show up when you mount on a camera