What would cause this?

I went through some coin rolls today, and came across this interesting coin. It looks Gold in color, and I don't know what would cause a penny to look like this. Any ideas?




Thanks!

 

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http://www.youtube.com/watch?v=_g_ml8tAnWE

 

Is that Lurch from The Addams Family narrating that video? Lol

 

I was thinking more like "I want to play a game. Here's what happens if you lose. The device you are wearing is hooked into your upper and lower jaw...."

 

That's really interesting. Thank you!

I still think it looks pretty awesome in the light.