No person shall paint, post, place, hang, suspend or affix any
advertisement, card, poster, sign, banner or streamer, of any nature,
or for any purpose, or cause the same to be done, on or to any curbstone,
flagstone or any other portion of any street or sidewalk, or upon
any tree or lamppost standing or erected on any public street or other
public place, or upon any pole erected upon any public street, or
other public place, which pole is used to carry telephone wires or
cables, electric light wires or other electric conductors, or to any
hydrant, bridge or other public structure within this City; provided
however, that nothing herein shall apply to any official notice required
by law or ordinance to be posted by public officers.