Nikon Nikkor 50mm 1.4 Ai-S Lens Not Working

Serial Number: 5513656

Lens only. No caps.

It shows signs of use.

The optics are free of scratches, haze, and fungus. There are a few dust specks inside.

There is oil on the diaphragm and the aperture only closes down when the aperture lever on the rear element is pushed. Focus ring moves smoothly.