Where any excisable goods manufactured at a place of business had been removed without payment of duty for carrying out tests or any other process not amounting to manufacture, to any other premises, whether registered or not, in accordance with the provisions of existing law prior to the appointed day and such goods, are returned to the said place on or after the appointed day, no tax shall be payable if the said goods, after undergoing tests or any other process, are returned to the said place within six months from the appointed day:
Provided that the period of six months may, on sufficient cause being shown, be extended by the Commissioner for a further period not exceeding two months:
Provided further that if the said goods are not returned within the period specified in this sub-section, the input tax credit shall be liable to be recovered in accordance with the provisions of clause (a) of sub-section (8) of section 142:
Provided also that the manufacturer may, in accordance with the provisions of the existing law, transfer the said goods from the said other premises on payment of tax in India or without payment of tax for exports within the period specified in this sub-section.