Need help to identify a coin.

Please help identify this coin, found in europe, western Latvia.

 

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Because of the raised area in the center of one side, I'm going to guess that it's a button.
Used to be where the shank was.

 

A little research on a heraldry site might turn up the origin of the crest, and identify it as a button from some type of uniform.

 

It is anew idea for me, and seems very true. Thank You!