I found the other day a near-mint condition Nikkor-P 300m Prime with the original leather casing and metal lens cap. No mould or anything else like that!
It is a heavy lens! Even for me. It is all metal and glass so hand holding it quickly became a task.
I cannot believe for a lens that is 50+ years old how great the quality is; it is tack sharp to me and the bokeh is very smooth and blends seemlessly.
I took some quick snaps with it of some birds in the backyard, I will add more photos as I get around to using it!
The third image of the crop is at 100% at f/4.5 with no post processing done at all! The first two images have their levels adjusted and that's it.
Given the age it is all manual, which doesn't concern me personally but may others.
Overall, a superb lens!
Shot a f/8;
100% crop at f/4.5, no PP done;