The Official Zoning District Map shall be identified by the signature of the Chairman of the Board of Supervisors, attested to by the Township Secretary/Treasurer 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 Article III of Ordinance Number 105, as amended, of Mount Pleasant Township, Washington County, Pennsylvania," together with the date of adoption of this chapter.