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Sex Detector (1950s)

Tiny 2-1/2 inch tall paper tissue envelope marked "Japan," and contains a little metal pointer on a string. It does not come with instructions, but was a somewhat known novelty item many decades ago. Presumably you could hold it over the palm or belly of a pregnant woman and determine the sex of the baby by the movement of the pointer . . . if it swung back and forth, it was going to be a girl; if it went in a circular month, it was a boy. We assume it will be correct 50% of the time.