Found this coin!!! Any info would be appreciated

I found this 1978 Washington quarter with no mint mark. What is different about this particular coin is the circular indentation on the Washington side. Is this a know error and furthermore could this coin be valuable??? There is a slight indentation in the reverse side as well. Thanks for look everyone!!!

 

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The coin was damaged after it left the mint.
Welcome to CT.

 

The reason the coin doesn't have a mint mark is that up till 1979, when quarters were minted in Philadelphia, they didn't put a P mint mark on it. Your quarter is from Philadelphia and is not an error.

The circle is damage

Your Quarter is worth 25C

 

I thought that this would be the case as I couldn't find any other error even remotely similar to it. Thanks for taking the time to take a look

 

The circle was cause by a rolling machine or a counting machine.

 

http://www.jimscoins.com/error_coin_examples.php heres a list of errors if you want to get into error coins..