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Guess #1 - crucible
Guess #2 - bottle stopper

If it does have mercury, at least the fish aren't drinking out of it any longer!!
 
It looks like a bottle stopper. There would have been a cork in that hole that protruded out. Probably broke off or rotted away. Could be from a fancy bottle of rum or other fine liquor.

ScubaToneDog
 
https://www.shearwater.com/products/swift/

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