N.Y. Surr. Ct. Proc. Act § 701

§ 701. Requisites of letters\n 1. Letters granted by any court to a fiduciary shall be issued in the\nname of the people of the state, attested in the name of the judge of\nthe court, sealed with the seal of the court and signed by the court or\nthe chief clerk of the court or such other officer as the chief clerk\nshall have authorized or deputized for the purpose.\n 2. To all letters of guardianship of the property of an infant, the\ncourt must cause a copy of 1719 and 1720 to be annexed or printed\nthereon.\n 3. No court except the court which issues letters shall have power to\nsuspend, modify or revoke them, so long as the court issuing them has\njurisdiction of the estate or matter in which the letters were issued.\n