anyone seen anything like this, button?

[JUNKYARD DOG]

Found today little button or pin, cant tell for sure. It is a little over 1/2 inch dia. How should I go about cleaning it? it is brass or copper I think. Any info would be great. Found in Mid Missouri.

 

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[fortbball9]

I have no idea but the star could stand for a lot of things.A very sweet find though.

 

[CRUSADER]

Maybe the studded screw out of a handle on a hand saw Does it look like anything was attached on the back?
Don

I agree, that it doesn't look button like, but no idea whats its off.