(a) Each person registered under this act shall obtain a seal of a design authorized by the board, which shall bear the registrant's name and number and the legend “Registered Landscape Architect.” The seal or a facsimile imprint of same shall be stamped on all plans, specifications, plates and reports issued by a landscape architect.

(b) It shall be unlawful for any person to use the seal during the period the license or registration of the holder thereof has been suspended or revoked or to use a seal of any design not approved by the board.