Manufacture or sale, etc., of certain knives
53. Any person who manufactures, sells or hires or offers for sale or hire, exposes or has in his possession for the purpose of sale or hire, or lends or gives to any other person—
(a)any knife which has a blade which opens automatically by hand pressure applied to a button, spring or other device in or attached to the handle of the knife, sometimes known as a “flick knife” or “flick gun”; or
(b)any knife which has a blade which is released from the handle or sheath thereof by the force of gravity or the application of centrifugal force and which, when released, is locked in place by means of a button, spring, lever, or other device, sometimes known as a “gravity knife”,
shall be guilty of an offence and shall be liable on summary conviction to imprisonment for a term not exceeding 6 months or to a fine not exceeding level 5 on the standard scale or to both.