Industry/97 - Works of art, collectors' pieces and antiques/9704 - Postage stamps, revenue stamps, postmarks, first day covers, postal stationery (paper with stamps) and similar articles, used or unused, other than those of heading 49.07/
9704 - Postage stamps, revenue stamps, postmarks, first day covers, postal stationery (paper with stamps) and similar articles, used or unused, other than those of heading 49.07