Roosevelt Dime with 75% copperized obverse/reverse.

Hi.

I recently discovered this 1978D Roosevelt Dime looks to have copper plating on about 75% of both its sides. I know that the interior of a dime is a full copper core, but I'm trying to determine what would cause this. Is this man-made or was this an error at the mint itself in how it was made.

Thanks for your help

 

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i'd vote its post mint ... its looks like some kind of paint ????

 

I would have to agree with Snowman. The fading effect isn't what a real error and I would do a little more research on it instead.

 

Toned.

 

Thank you all for looking at this. Alas. Here I thought I had the next 1933 $20 double Eagle. Turns out I've got 10 cents and a can of spray paint. Oh well.