What is this?!?

What coin is this? i have one and i could never figure out what it is, is it valuable?

 

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Presidential Medal. Depending on the size of yours, it's one of these:
http://catalog.usmint.gov/webapp/wc...ctId=11027&langId=-1&parent_category_rn=10196
http://catalog.usmint.gov/webapp/wc...ctId=10722&langId=-1&parent_category_rn=10196