It is unlawful to manufacture, cause to be manufactured, possess, display, offer, sell, lend, give away, or purchase any brass or metal knuckles, bludgeon or any knife which has a blade which opens automatically by hand pressure applied to a button, spring or other device or any knife having a blade which opens, falls or is ejected into position by the force of gravity or by any outward or centrifugal thrust or movement. (Prior code § 7-1-14(f))