This is an Nikon Aetna Rokunar 1:3.5-4.5 28-80mm Auto Zoom Camera Lens.
It is black and has both lens caps.
It was made in Japan and measures 4.5" tall, 3" wide at the widest part and 2" wide at the smallest part.
This camera lens comes in good pre-owned condition with slight scratches and smudges on the lens. The mount is unknown.