pressure cooker lid?

>>> "Kenline, Brooke" 08/29/13 1:24 PM >>> 
Hello everyone- 

I could use some help with identifying this historic iron-alloy artifact: http://www.flickr.com/photos/101041879@N08/9623689752/in/photostream/ 
The context is North Carolina anywhere from the late 19th to the mid 20th c. My first guess was a hubcap, but I am not completely sure and could use some input! Thanks! 

Brooke Kenline 




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