244. Notwithstanding anything contained in article 16 or in the last preceding article of this Constitution, it shall be lawful for any State-
(a) To impose on goods imported from other States any tax to which similar goods manufactured or produced in that State are subject, so, however, as not to discriminate between goods so imported and goods so manufactured or produced; and
(b) To impose by law such reasonable restrictions on the freedom of trade, commerce or intercourse with that State as may be required in the public interests:
Provided that during a period of five years from the commencement of this Constitution the provisions of clause (b) of this article shall not apply to trade or commerce in any of the commodities mentioned in clause (a) of article 306 of this Constitution.