The Laws specified in the Schedule are hereby repealed to the extent set out in the fourth column of the said Schedule: Provided that any duty which has at the date of commencement of this Act become payable under any law so repealed, but which has not at that date been paid, shall be recovered in accordance with and subject to the provisions of the said law: Provided further that if any such duty was not paid before the twentieth day of March 1963, any interest payable in respect of such duty under any such law for the period from that date to the date of payment of the duty, shall be calculated at the rate of seven and a half per centum per annum in respect of each completed month in that period.

[Section 21 substituted by section 3 of Act No. 72 of 1970]