Need help with coin ID.

[Crawdigger]

I have been detecting the same 1840's plantation for almost a year and a few months ago I found this. I didn't pay much attention to it at first because, due to the size, I presumed it was junk.
I took it home and today I cleaned it off and I can vaguely make out writing on it. I'm not sure if it's a coin, a token, or trash.
Thanks!

 

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[Iron Patch]

The lemon juice worked ok on the surface dirt. Tomorrow I planned on doing electrolosis. I'll post the exact weight and size as well. Thanks diggummup.

You're already down to the base metal. Any form of cleaning will just make it worse from this point.

Lemon juice is extremely hard on copper so peroxide would have definitely been a better starting point.

 

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[bigfoot1]

I'll chuck this one out there only because the style and position of the 5 look familiar...french emergency coin