law: Indian Stamp Act, 1899 
  55. Allowance on renewal of certain debentures 
  When any duly stamped debenture is renewed by the issue of a new
  
  debenture in the same terms, the Collector shall, upon application made within
  
  one month, repay to the person issuing such debenture, the value of the stamp
  
  on the original or on the new debenture, whichever shall be less:
  PROVIDED  that the original debenture is produced before
  
  the Collector and cancelled by him in such manner as the State Government may
  
  direct.
   Explanation :A debenture shall be deemed to be renewed in
  
  the same terms within the meaning of this section notwithstanding the following
  
  charges:
  (a) the issue of two or more debentures in place of one original
  
  debenture, the total amount secured being the same;
  (b) the issue of one debenture in place of two or more original
  
  debentures, the total amount secured being the same;
  (c) the substitution of the name of the holder at the time of
  
  renewal for the name of the original holder; and
  (d) the alteration of the rate of interest or the dates of
  
  payment thereof.