12. The party serving the notice shall, within three days at most after such service, indorse on the notice or a copy or duplicate thereof the day of the month and week of the service thereof, otherwise the judgment creditor shall not be at liberty to issue execution of the judgment, and every affidavit of service of such notice shall mention the day on which such indorsement was made. This rule shall apply to substituted as well as other service.The three days limited by this rule may under special circumstances be extended by the Court.