Hey!
It looks like it has a Psycho Psycles "eyeball" cable hanger stuck in it?
Wow...that is so cool! ❤No it is a real "glass eye"! I contacted a company down in San Diego that made glass eye prosthetics back when I made the 25A series cruisers because I wanted to place one in the billet stem of my personal bike (the Bitch). I was able to talk to the owner of the company and he thought my idea was such a hoot that he sent me a hand full of "seconds" (not correct iris color match to the patients good eye)... Free of charge!
Here is a picture of my bikes hub polisher:
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