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That 85 is fake, and likely the 91 as well
That was my instinctive response as well. The 1885 looks like a mushy, cheap Chinese fake. The 1891 looks "better", but still close enough to the other fake that's it's definitely suffering from guilt by association.
I think the yellow colour is coming from the coins being made of brass with a thin silver wash, and someone's tried to clean them and started polishing the silver layer away, showing the brass core underneath.
Don't say "infinitely" when you mean "very"; otherwise, you'll have no word left when you want to talk about something really infinite. - C. S. Lewis