🔎 UNIDENTIFIED Bronze lid?

[DetectingWithM&N]

It looks like some lid, we are not sure about the age or purpose of the item. Could you help us?

 

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[ARC]

Looks like a light socket cap.

 

[ARC]

Cannot find exact one like yours... but this is close... and what i am referring to.

 

[vhs07]

Size looks right for a light socket, but I can't recall ever seeing one that wasn't threaded.

 

[ticndig]

maybe it's a radiator pipe escutcheon