Four Shot Pistol:
"A 4-barrel zip gun found on the shelves of the Kingston Penitentiary library on October 1945. The trigger, now missing, was a clasp from an overshoe."
added this one to:
Shiv:
"disguised as a wooden crucifix; found in an inmate’s cell in Wolfenbüttel prison, Germany, sometime around 1994; intended for use in an escape or as a general weapon. At that time a lot of crucifixes were fashioned in prison woodshops until jailers finally figured out their true purpose.[/quote]