Nikkor-P Auto 4.5 300mm

Another pre AI I picked up, not a bad lens probably around f8 is best, but some what heavy, be good to have in a bar fight, lol.

There are some small black spots inside the rear element, dosnt look like fungus more like some one flicked some cigarette ashes and small bits fell inside, doesnt effect the photo's any. Any one seen this before? at first I thought it was pieces of the felt from the leather case that fell on the outside of the rear lens, but there are several of them all towards the center of the element but very small.

Could be some of the internal material used to prevent reflections that’s flaked off, maybe due to being exposed to excess environments snd/or just years and years of being “out there” in use by who-knows how many others.