Upon the request of any person interested therein, such clerk of the county court shall also admit any such writing to record, as to any person whose name is signed thereto, upon a certificate of his acknowledgment before the president of a county court, a justice of the peace, notary public, recorder, prothonotary or clerk of any court, within the United States, the Philippine Islands, Island of Puerto Rico, Territory of Alaska, Territory of Hawaii, or any other territory, possession or dependency of the United States, or a commissioner appointed within the same by the Governor of this state, written or annexed to the same; or upon a certificate so written or annexed under the official seal of any ambassador, minister plenipotentiary, minister resident, charge d'affaires, consul general, consul, deputy consul, vice consul, consular agent, vice consular agent, commercial agent, or vice commercial agent, appointed by the government of the United States to any foreign country, or of the proper officer of any court of record of such country, or of the mayor or other chief magistrate of any city, town or corporation therein, that such writing was acknowledged by such person, or proved as to him by two witnesses, before any person having such appointment, or before such court, mayor, or chief magistrate.