Whats this metal piece?

[ragingmike]

I found this in my yard in the middle of Nassau County on Long Island
It doesnt look like there are threads on the inside

 

[bowwinkles]

Looks to be a removable industrial floor drain grate, like found in old gas stations.

 

[Loco-Digger]

Could be part of an air intake from an old cast iron stove

 

[Tom_in_CA]

Looks like a 1996 clad quarter to me.