(4)If within the expiry of the said period of one hundred and eighty days, the holder of any bond fails to require payment of its face value from the Corporation concerned, the bond shall cease to be redeemable at the option of the holder:Provided that in any case the Corporation may by notice require the holder of the bond to accept its face value in cash at any time whether before or after the expiry of the period of five years aforementioned.
