This is a rare 6 blade Lens is in excellent condition. There is no fungus, haze, mold, scratches or cleaning marks.

There is a small hair and some dust inside however does not affect an the image at all.

The focus is a little bit stiff but works properly.

In my research, the serial number shows that it’s a Lenses that was made using thorium.

However, there is no yellowing of lens or the image of renders.