1963 British One Penny Possible Error?

I'm a newb when it comes to coins. While cleaning out my aunt's house I found a bunch of old coins, including this penny piece. I think it has been damaged, but I would love it if someone more knowledgable would take a look, and if it is damaged explain how.
The coin in question is on the left, and is pictured next to an earlier example from the same series.

Thanks in advance!

 

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Someone took it to a grinding wheel. Weigh them, you'll see a difference.

 

Yup. My kitchen scale shows a 1-2 gram difference between the two. I do wonder what's with the lines tho.

 

Scratches.