Demonetisation of currency notes and coins
18.—(1)  The Board may declare, by notification published in the Gazette, the withdrawal of any particular issue or denomination of notes and coins issued by the Board.
(2)  Any such notification shall give holders of the notes and coins to be withdrawn a reasonable period, in any event not less than 6 months, within which such notes or coins shall be exchanged at their face value for other legal tender issued by the Board.