law: State Bank of India Act, 1955
  5. Issued capital
  (1) The issued capital of the State Bank shall, on the appointed
  
  day, be five crores, sixty-two lakhs and fifty thousand rupees divided into
  
  five lakhs, sixty two thousand and five hundred shares, all of which shall, on
  
  the appointed day stand allotted to the Reserve Bank in lieu of the shares of
  
  the Imperial Bank 8[transferred to and vested in it under section
  
  6].
  (2) The Central Board may from time to time increase the issued
  
  capital but no increase in the issued capital shall be made in such a manner
  
  that the Reserve Bank holds at any time less than fifty-five per cent. of the
  
  issued capital of the State Bank.
  (3) No increase in the issued capital beyond twelve crores and
  
  fifty lakhs of rupees shall be made under sub-section (2) without the previous
  
  sanction of the Central Government.