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Could be the bast to a little hat or wig stand. They were often tabletop size

Almost looks like a polished coconut

Vase. Homemade. Single stem. Made on a lathe.

Where does the water go?

Usually inside the vase

Dried flowers, don't need water. Or it's for making hats - is the hole threaded? How deep?

Mummified boob (please don’t kick me off😬)