Article 4
1. A certificate of authenticity shall be valid only if it is duly completed and endorsed, in accordance with the instructions set out in Annex I, by an issuing agency appearing on the list given in Annex II. (1) OJ No L 148, 28.6.1968, p. 24. (2) OJ No L 291, 19.11.1979, p. 17. (3) OJ No L 19, 23.1.1974, p. 10. (4) OJ No L 204, 2.8.1975, p. 14. (5) OJ No L 75, 23.3.1977, p. 10. (6) OJ No L 111, 4.5.1979, p. 14. 2. The certificate of authenticity shall be deemed to be duly endorsed if it specifies the place and date of issue and if it bears the stamp of the issuing agency and the signature of the person or persons empowered to sign it. A printed seal may be substituted for the stamp.