Notice the wreath is half olive branch, half arrows? Typical US symbolism. Then there's the crown. My guess would be Royal Canadian Air Force button with a twist.
It's a button...typical for the 1800-1830 time frame based on the construction and backmark with the crown which is what you are seeing . Origin is likely Britain. I find many at the older colonial sites I metal detect..often coins resemble button with their shanks removed and vice versa.
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