§ 10.21 CORPORATE SEAL.
   There shall be a seal of the city which shall be called the corporate seal, and shall be kept by the City Clerk, and used by him officially as directed by law. This seal shall have engraved upon it the words, "City of Tuscola, Illinois," encircling the word "Seal."
(ILCS Ch. 65, Act 5 § 2-2-12) ('69 Code, § 2-1)