Got one, finally

The back of the penny stamped on the front, is something going on in the back?

 

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It's called a clash. When both the dies strike each other with no blank planchet in between they leave a slight image of each other. Then when eventually the blanks are struck they will leave the clashed image.

 

I agree with @paddyman98. Here a link to a site about this - http://www.error-ref.com/die_clash/

 

Got it, thanks, I guess I already do have a "clash" coin but it's so different, I'll read up more

 

Have a look Marie: http://www.maddieclashes.com/tdc-1c-1984-02/

 

Nice find!