What do collectors call this?

Oh, how I have missed those golden pictures of yours, @Insider.

The coin in the OP looks more to me like a lamination than any of the other things that you have listed, but as I have said before... what do I know?

 

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If a die chips it results in a RAISED feature on a coin not a recessed one.

 

I think a chipped die and a die chip are different animals.

 

I think the John Hancock building is in Chicago.

 

It was the one in Boston that had the window problems (John Hancock Tower)

 

John got around some.

 

Yes there are different animals, a chipped die (recessed hole, or space if the chip is at the edge) results in a die chip (raised lump) on the coin.

 

So what is the correct answer? I see Insider said "That was too easy! " but never said what the answer given before that was the right one. Worst. Teacher. Ever.

 

It's glue or something similar

 

Mine.

 

Second pic showed it better. I’m in agreement it’s glue or a foreign substance

 

Sorry, guess it was not too easy. Glue or varnish type of substance. It is raised and off-color with trapped bubbles. There is a split where the rim is not coated. To the naked eye, it may look like a mint error. Came off with acetone.