Did some searching this morning and found this photo. Looks visually very close. This is a shell from the US battleship Missouri. Maybe the red paint is original. No idea how tall the woman is but I measured my head and my wifes head, her's is actually bigger than mine but both of us are around 8". The base diameter comparing the bottom of the shell seems too large even though the profile looks correct. But measuring a photo is imprecise.
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