I don't know the lens structure of this particular lens, but it looks like breakdown of a side/rear paint job. Very well known "problem" with, especially, Schneider lenses. Just a cosmetic/resale value problem. A variety of "Schneideritis" - only a real problem if the flakes can move about between lens elements.
My local Schneider service center does not repair that kind of "problem" as it is not believed to affect optical performance. You might want to find your local Schneider repair center (wherever that may be) and see if they concur.
It's not a problem.
Or, do a DIY repair. Not that hard usually.
I don't think it needs "repaired". An unskilled hand could do damage in the attempt to correct a harmless cosmetic issue.
I think there is an older thread where it is mentioned that opening a Super-Symmar XL lens for DIY may not be a good idea owing to the unusually fine mechanical tolerances of this design......
There is a cosmetic issue but not one that would affect the performance of the lens. If you open it up, there will probably be marks on that front ring from where you use a wrench and it will forever look like a lens that has been opened up. (It is possible a rubber cup could turn the ring and not leave a mark, but usually that is not the case.) If it works fine I sure would leave it alone. I've opened plenty of lenses for internal cleaning but never just to try and deal with Schneideritis.
The lens is not that mysterious.
The very front lens element is a thick piece with Frosted barrel and base. And you just need to put that element inside the lens house. I do not have anther same lens to compare, maybe Schneider paint something adsorbing light reflected inside the lens house, but I do not know, but probably there is no such painting, just a bare lens element.
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