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Looks like a car alarm indicator.
Edit;
I've never seen a classic in person so I thought maybe it was original. There is nothing on the back and I couldn't find anything connected to it when I pulled the parts. Going in the for sale section soon...
At least the installer didn't drill through the Classic Plaque to install the light.
I'll check, but I don't think the junker Classic that I own has it.
It isn't a Classic thing. I've had 6 Classics and none of them have/had that light.