Any idea what type or timeframe?

[4runner]

 

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[Davers]

Look's old.
Id post it on today's finds or what is it? If you have not already.
Davers

 

[GatorBoy]

I'd say it's at least 19th century its a brass flat button that's missing the shank.
That rope border I've seen on regiment buttons dating back to the Revolutionary War.
Can you make out possibly a number in the center of the front of that button?
Or any writing it all on the back? A little warm soapy water might bring it out a little

 

[GatorBoy]

This is a Maine militia button. Around 1820 ish



It might just be my eyes playing tricks but it seems like I see an eagle with his head turn to the left.
If its not a civilian button it could be a Union Navy button from the Civil War era