Button id

[plymouthian12]

Found this button in the ocean wondering if it is a uniform button about 3/4 of an inch across. Thanks for your help. Quarter for size comparison

 

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[fyrffytr1]

I have my doubts about it being a clothing button mainly because of the shank part being a good bit off center and how big that part is. That being said I don't have any idea about what it could be.