🔎 UNIDENTIFIED Need help with ID and age

[savinghistoryalway.s]

 

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[vpnavy]

OMG - You found a...Just kidding!

EBAY: Ancient Extraterrestrial Alien Ring

 

[Blackfoot58]

Appears to be some type of flange.

 

[Mine Shaft]

Part of the old brass rain bird sprinkler head just a guess.