(a)   Notice of the refusal of invitation to solicitors to any residence shall be given on a weatherproof card, approximately three inches by four inches in size, exhibited upon or near the main entrance door to the residence, indicating the determination by the occupant, containing the applicable words, as follows:
   (b)   The letters shall be at least one–third of an inch in height.  For the purpose of uniformity, the Police Chief may provide the cards to persons requesting them, at the cost thereof, if available.
   (c)   The card so exhibited shall constitute sufficient notice to any solicitor of the determination by the occupant of the residence of the information contained thereon.