The Official Zoning Map shall be identified by the signature of the Mayor and President of the Council, attested by the Borough Secretary and Solicitor, and bearing the Seal of the Borough under the following words: "This is to certify that this is the Official Zoning Map referred to in Article VII of this chapter of the Code of the Borough of Evans City, Butler County, Pennsylvania," together with the date of adoption of this chapter (June 1, 1970).