Each architect shall have a seal approved by the board, which shall contain the name of the architect and the words, “Licensed Architect, State of Connecticut”, and such other words or figures as the board deems necessary. The working drawings and specifications prepared for such buildings or structures, which by the terms of this chapter shall be prepared by a licensed architect, shall be stamped with his seal. No person shall designate or imply that he is the author of such working drawings or specifications unless he was in responsible charge of their preparation, whether made by him personally or by his employee or agent under his immediate supervision. Working drawings and specifications prepared by an architectural firm shall be sealed by a principal member or officer of the firm. Except for plans for buildings or structures under the provisions of section 20-298, no official of this state or of any city, town or borough therein, charged with the enforcement of laws, ordinances or regulations relating to the construction or alteration of buildings or structures, shall accept or approve any plans or specifications that are not stamped with the seal of a licensed architect or a licensed professional engineer.