A seal making an impression as follows: In the center thereof in appropriate style the words, “Official Seal,” and around the outer edge thereof the words, “The City of Pasco, Washington,” shall be and is declared, designated and adopted to be the seal of the City. The seal of the City shall be kept by the City Clerk and by him affixed to all acts required by him to be authorized. [Code 1970 § 1.04.010; Code 1954 § 1-1.99.]