It doesn't look like it unscrews. It appears the center clevis is soldered in like the bottom and vent like opening. It isn't one of a kind...
I really don't have any good idea what it is. Would think it was around heat since it is copper. The clevis with pin makes you think it could be...
Hope this might help. [ATTACH] [ATTACH]
Will try to get another photo. The item is in another state so maybe I can get someone to email me a picture of the bottom. All I remember is...
Going through some of my mother-in-laws antique collection and we are having a hard time figuring out what some of the items are. We were hoping...
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