Is this remnants of a flat button? If so, can anyone give me an age?

[turtlefoot13]

Going through some finds and came across this. It is non-magnetic and looks like there is a spot on the one side where a shank was. It is pretty well toasted. If anyone can help, I would appreciate it.

Doug

 

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[rick67]

Being it toasted already. Why not try electrolysis to give it better definition.

 

[duggap]

It is definitely a flat button. They were used primarily from 1790 to 1840s.