1918 KN British penny error?

Hi
You can see the outline of Edward`s head coming through the coin
I was just wondering was this an error?If it is, is it worth much?
It is a good date because of the mint mark.
Thanks

 

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This is very common with coins from the UK at that time, It´s ghosting of the image due to the pressure of the minting being to much. You should find both sides having the same effect.
Siggi

 

I see thanks for the very quick reply.