(2) 50. If any person disposes of any article on which is stamped, engraved or impressed or to which is otherwise applied the word “design” or “registered design” or any other word expressing or implying that— (a) there is a registered design in respect of the article; or (b) the article is the subject of an application for registration of a design, or to which any marking is applied in any manner so expressing or implying, he shall be deemed for the purposes of this section to represent that there is a registered design in respect of the article or that the article is the subject of an application for registration of a design. (3) The provisions of subsection (2) shall not apply to a person who disposes of articles in good faith in the ordinary course of trade, provided, when called upon to do so, he discloses the identity of the person from whom he acquired the article in question. (4) Any person who is of the opinion that he is prejudiced by a representation referred to in subsection (1) (a) or (b), may apply to the court for an interdict against the continuation of that representation. Documents may be sent by post. Any application, notice or document authorized or required in terms of this Act to be lodged, made or given at the designs office or to the registrar or any other person, may be delivered by hand or sent through the post. 51. 52. Address for service. (1) With every application, notice or other document authorized or required in terms of this Act to be lodged or given, the applicant or other person concerned shall furnish in the prescribed manner an address within the Republic as an address for service, which shall for the purposes of this Act be deemed to be the address of such applicant or other person, and all documents in relation to such application, notice or other document may be served by leaving them at or sending them to such address for service. (2) Any address for service may be changed by notice in the prescribed manner. Calculation of periods of time. (1) Where any period of time is specified by this Act as running from the performing of any act, it shall be reckoned as commencing on the day next following the performing of that act. (2) Whenever the last day on which, in terms of this Act, any act may or is required to be performed or any document may or is required to be lodged, falls on a day on which the designs office is closed, that act may be performed or that document may be lodged on the next following day on which the designs office is open for the transaction of business.