This circa 1880 anti-masturbation device is currently up for auction on eBay. The starting bid is $1500. From the auction listing:
EXTREMELY RARE ANTI MASTURBATION DEVICE DATING FROM c1880. THE COPPER SHAPED DEVICE WAS ATTACHED TO A BELT AND WORN BY BOYS AS A MEANS OF PREVENTING NOCTURNAL EMISSIONS. VERY MUCH AN INDICATION OF SOCIETIES VIEWS ON ONANISM IN THE 19TH CENTURY. THIS IS THE FIRST EXAMPLE WE HAVE OFFERED FOR SALE IN 24 YEARS. THE CONDITION IS EXCELLENT 3 ½ INCHES TOP TO BASE.
Link (Thanks, Michael-Anne Rauback!)