Lens defect

Might just need a cleaning...might be coating defect. Hard to say.
If the price is right, and you’re feeling lucky...
 
If it is easily removable, an experienced seller would have removed it before taking the photo. Expect it to be permanent.
 
It's hard to tell exactly what that is due to the low resolution of the original. A couple of things come to mind though. On first look it could be just reflections. It's not separation because the front element of this lens is not connected to the second element. What I've found before is someone used way too much lens cleaner, and it migrated around the edges of the front element to the back side. But whatever it is means the lens will have to be opened up to fix it.

https://richardhaw.com/2018/07/28/repair-nikkor-35mm-f-2-ai/

PF
 
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Wow, thanks a lot for the replies. I’m impressed. The lens is sold from estate, so not a professional lens trader. It was very cheap so I wanted to known if there were a chance this is only due to oil smear on front element or that a like. I guess you’re right, it’s a easy find so i’ll just pass and find another (tho more expensive)
Thanks again
 
It is difficult to say what it is. To me it looks like delamination but I can't be sure. Delamination of this degree is highly unlikely to have any visible effect on the picture but it can get progressively worse. I would consider buying it if it was cheap though. I have a AF Nikkor 50 f1.4 suffering from delamination and is a very good performer.
 
Those stains are so close to the edge that no image forming light enters from that area.
As long as the price reflects cosmetic condition then somewhat grungy lenses can be good deals. Most all of my OM Zuikos were purchased used and in ‘cosmetically challenged’ condition and are fine.
 
Sorry to not get back to this before now, Pan. Something about retooling the site got in the way.
What happens is whatever was on the front of the lens is now on the rear of the element, and lens cleaning fluid always has a residue that also needs to be removed, so no, it's not going away on its own.

PF
 
My experience is that buying from an estate is nearly always problematic. Sellers often don't know how to describe an item, don't understand its function, and don't have an appreciation of the precision required of photographic equipment. Too often items "look OK" or "seem to work" or belonged to "a professional" who put away his cameras 20 years ago. In the words of W.C. Fields, the situation is fraught with immanent peril.
Buy from a respectable dealer. It's worth the little bit extra!
 
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