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.