Within sixty days after the notice shall have been deposited in the post office or personally served, every person, occupant, owner, householder or organization shall cause to be affixed suitable numbers at least three inches in height, and of metal or appropriate construction, at or near the front entrance of such home, residence or place of business, readily visible from a point on the sidewalk and street in front of such home or building. (Ord. 1325, Art. III §3, 1980).