Old button? Old coins? Colonial? Need help identifying

[crossfire631]

[h=2][/h]

Found these at same site few years ago. I've been told site very old dates back to colonial era. Thinking larger one is maybe a button due to small tab on back?
Two smaller I’m guessing coins but can’t identify. Any help would be appreciated. Thanks!
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[Gene Mean]

Nice finds. Really hard to say. The first pic looks like a button. Try soaking in lemon juice to clean up more.