looks like a coin?

[thedukeofdelaware]

At first I thought this was just a penny, but I don't think that's the case. It's slightly concave (or convex, depending on how you look at it). It's slightly smaller than a penny. There are wavy lines on one side, and I can't make out anything on the reverse side. Any recommendations on cleaning it are appreciated, does anyone know what it is?

 

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[jewelerguy]

looks like a flat button with the shank broken off to me

 

[coinman123]

Yup! Late 1700's early 1800's flat button! Any writing on the back?

 

[thedukeofdelaware]

I think there is writing but I can't make it out. Any cleaning tips?

 

[thedukeofdelaware]

I have a feeling white vinegar isn't the play..