Found metal detecting by my house

[Bugzy99]

My house was built in the 1920s......the cross pieces were on the bottom and the edge of the top was only an inch below the surface. It is about 20 inches tall.....I was hoping for a nice cache of coins ; ) 7

 

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[kenstein]

Was thinking maybe a plumbing valve box, but there should be holes in the side for pipe to pass through.

 

[vhs07]

Looks like a roof vent with the spinner missing

 

[cudamark]

I agree, some sort of vent or ducting is what it looks like. Of what kind of metal is it made?