US 2000 P small dollar [solved]

Hello,

While looking through some small dollars, I found the one on the left. It is super, unusually, shiny. On the reverse, at about 11:00, some of the plating appears to have come off, revealing a gray base. It does not look normal to me, and I was hoping you know what's going on with it.

I put a regular one on the right for reference. The difference between the two is much stronger in person...

Gold plated as a novelty:

Quote: "Cerulean"​Gold plated as a novelty:
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​ok, that makes sense! This would be the first small dollar that I run into that's gold plated.

Thanks, Cerulean!

John