(2) Where a writ has not been served on a defendant, the Court may by order extend the validity of the writ from time to time for such period not exceeding six months at any one time, beginning with the day next following that on which it would otherwise expire, as may be specified in the order if an application for extension is made to the court before that day or such later day (if any) as the Court may allow. (3) Before a writ, the validity of which has been extended under this rule, is served, it shall be marked with an official stamp showing the period for which the validity of the writ has been so extended. (4) Where the validity of a writ is extended by order made under this rule, the order shall operate in relation to any other writ (whether original or concurrent) issued in the same action which has not been served, so as to extend the validity of that other writ until the expiration of the period specified in the order. Validity and renewal, renewal of originating summons 16. For the purpose of service, an originating summons (other than a concurrent one) shall be valid in the first instance for twelve months beginning with the date of its issue and a concurrent originating summons shall be valid in the first instance for the period of validity of the original summons which is unexpired at the date of issue of the concurrent summons. Endorsement of renewal. Civil Form 6. 17. A judge may order two renewals in each case strictly for good cause and upon prompt application, provided that no originating process shall be in force for longer than a total of two years. The Registrar shall state the fact, date and duration of renewal on every renewed originating process. Loss of originating process 18. Where an originating process is lost after issue, a judge upon being satisfied of the loss and of the correctness of the process may order the copy to be filed and sealed in place of the lost originating process. Concurrent originating process 19. A plaintiff may at the issuance of an originating process or at any time during its life span, cause to be issued one or more concurrent originating processes each to bear the same date as the initial process. Marked "CONCURRENT" and have stated on it the date of issue. Concurrent originating process for service within and out of jurisdiction 20. An originating process for service within jurisdiction may be issued and marked as a concurrent originating process with one for service out of jurisdiction and an originating process for service out of the jurisdiction may be issued and marked as a concurrent originating process with one for service within jurisdiction.