The item was successfully added to the shopping cart. View Cart #TY574 - Pair of Sex Detector Novelties - Japan You get the pair for $2.50. Vintage sex detector novelties. The one with the illustration on it says "Instantly Indicates the Sex of Humans, Animals, or Insects" "Wonderful Fun-Maker" "A Scientific Instrument Better Than the Ouija Board" "Circular motion Female" "Forward and Backward Male". The illustrated package is about 3" wide and contain a small tin bobber on a string that you dangled. The larger package is about 3 3/4" all and contain a larger tin bobber on a string (pictured), but no instructions (even though it says they are inside!). Both packages are marked "Japan" and are circa 1950. We had a few of these years ago, and they were very popular. Unsold old store stock we recently recovered from a warehouse in Northeast Ohio. Packages show typical minor paper aging. Parts inside are like new. $2.50 -+