9. The persons so appointed to sell stamps shall be bound, at all times, to keep on hand such a supply of stamps, during the period of their appointment, as may be reasonably expected to be required of them, and shall be bound to sell them to all persons who may demand the same, upon payment to them of the value of such stamps; and in case of any violation of any duty imposed by this section, they shall forfeit, as a penalty to Her Majesty, a sum of not more than $20, and shall further be liable for the damages sustained by any person through such violation of duty.
R. S. 1964, c. 80, s. 10.