The Official Zoning District Map shall be identified by the signature of the Chairman of the Board of Supervisors, attested by the Township Secretary and certified by the Township Engineer, and shall bear the Seal of the Township under the following words: "This is to certify that this is the Official Zoning District Map referred to in Part 3 of Ordinance Number 2007-2, as amended, of Smith Township, Washington County, Pennsylvania," together with the date of adoption of this chapter.