law: Indian Stamp Act, 1899 
  37. Admission of improperly stamped instruments 
   27  [The 6[State Government] may make rules
  
  providing that, where an instrument bears a stamp of sufficient amount but of
  
  improper description, it may, on payment of the duty with which the same is
  
  chargeable be certified to be duly stamped, and any instrument so certified
  
  shall then be deemed to have been duly stamped as from the date of its execution.