Unknown Cut Large Cent

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Unknown Cut Large Cent..
Don't know if I have it oriented properly but hoping someone can see by the shadows if this is a British, American or French coin?
Thanks.

 

[DCMatt]

A measurement in millimetres would be helpful.

 

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Here is a picture I forgot to add.

 

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I also forgot to say that there is no detail on the back of the coin.

 

[How Lucky]

Could this be the coin?

American Numismatic Society: Br Medal, Great Britain/United States, 1758. 2006.33.6