No sign or permanent external advertising display of any kind shall
be erected, altered or used in the Historic District, except for advertising
informing the public of the services, business, occupation or profession
carried on, in or about the property on which such sign or permanent
external advertising display appears. In conjunction with this, no
such sign or advertising display of any kind or for any purpose shall
be erected or altered, notwithstanding zoning sign approval, until
an application for review is submitted to and reviewed by the HARB
for its conformity in exterior material composition, exterior structural
design, external appearance and size with similar advertising or information
media used in the architectural period of the Historic District and
a certificate of appropriateness is approved by the Borough Council.