It shall be unlawful for any person to falsely impersonate, or represent himself to be a police officer, deputy sheriff, deputy coroner, or member of the Fire Department; or to wear the badge of a police officer, deputy sheriff, deputy coroner, or of a member of the Fire Department or to use any signs, badges or devices used by the Police Department, Sheriff's or Coroner's offices, or by the Fire Department, unless he is authorized so to do, and is a member of either of said departments or offices.