Mo. Rev. Stat. § 442.190: Certificate, how made.

Such certificate shall be

(1) When granted by a court, under the seal of the court;

(2) When granted by the clerk of the court, under the hand of the clerk and seal of the court of which he is clerk;

(3) When granted by an officer who has a seal of office, under the hand and official seal of such officer;

(4) When granted by an officer who has no seal of office, under the hand of such officer.