50p mint error or counterfeit?

Hello everyone. I am new to this site and I am looking for peoples input on a coin I have in my collection. It is a British 1997 50p coin (small size). One side is all smooth and you can see a small imprint on the outer side. I am not sure if the coin is a counterfeit or a mint error. Any knowledge anyone can share with me would be greatly appreciated. I've attached photos I hope you can see them. Thank you in advance!

 

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It looks like it has been ground off.

 

I agree, it looks smoothed out. If you can weigh it that would solve the mystery.

 

no need... it's been ground off.

 

Thanks for your help guys, that's a shame, thought I had a winner there

 

What should it weigh sorry for the silly question am new all to this, the coin is all smooth in the middle like it hasn't been touched the pictures don't do it justice I shall try up load some better ones shortly

 

A quick google search shows that it should weigh 8 grams.