law: Indian Post Office Act, 1898 
  16. Provision of postage stamps and power to make rules as
  
  to them
  (1) The Central
  
  Government shall cause postage stamps to be provided of such kinds and denoting
  
  such values as it may think necessary for the purposes of this Act.
  (2) The Central
  
  Government may make rules as to the supply, sale and use of postage stamps.
  (3) In particular and
  
  without prejudice to the generality of the foregoing power, such rules may-
  (a) fix the price at
  
  which postage stamps shall be sold;
  (b) declare the classes of postal articles in
  
  respect of which postage stamps, shall be used for the payment of postage or
  
  other sums chargeable under this Act;
  (c) prescribe the conditions with regard to
  
  perforation, defacement and all other matters subject to which postage stamps
  
  may be accepted or refused in payment of postage or other sums;
  (d) regulate the custody,
  
  supply and sale of postage stamps;
  (e) declare the persons by whom and the terms
  
  and conditions subject to which postage stamps may be sold; and
  (f) prescribe the duties and remuneration of
  
  persons selling postage stamps.