1940 S Nickel Possible Mint Mark Error?

Hi, first post here. It's a 1940 nickel, the S looks crooked, is this an error?

 

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That's not a mint mark.
If there were a mint mark, it would be to the right of Monticello.
It was put there after it left the mint.

 

War nickels were not minted in 1940. That S is not a mint mark. The mint mark on the 1940 nickel would be on the right side of the coin next to the bldg.

 

Kind of looks incused into the field. Probably a counterstamp added after it left the Mint.
Just damage

 

Post minting damage (counterstamp)