can you tell me what this is?

[Aurora1959]

found in my back yard in Central NY, previously a pasture in the 1960's, a public school from 1900 to 1940, a military academy type boarding school, and a regular boarding school founded in 1799.

 

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[cudamark]

Of what metal is this made? Lead? Copper? Brass? Steel? Cast iron?

 

[xr7ator]

Looks like brass to me.

 

[ARC]

Toothbrush... Soap... water... scrub ah dub dub.

 

[Mackaydon]

Whatever it is, it isn't a coin.
Don.....