<font color=blue>Is the bottom solid? Any hole(s) in it?</font color=blue>
Yep, solid. No holes anywhere.
<font color=blue>What kind of metal? Is it cast, turned, formed?</font color=blue>
Looks like cast iron.
<font color=blue>Any markings, decoration.</font color=blue>
No markings.
<font color=blue> How thick are the walls, and are they consistent?</font color=blue>
Walls are about a 1/4 inch and thin out near the lip.
<font color=blue>I was going to suggest a spacer of some sort, like on a disc but that would have had a hole in the bottom. Maybe just a decorative pot of some sort </font color=blue>
I was thinking disc as well, but without the hole, I agree with others that this might be some kind of planting pot