Section 21 Works of art, collectors pieces and antiques 97 Works of art, collectors pieces and antiques 97 04 Postage or revenue stamps, stamp-postmarks, first-day covers, postal stationery (stamped paper), and the like, used or unused, other than those of heading 4907 Commodity Code Description 97 04 00 Postage or revenue stamps, stamppostmarks, firstday covers, postal stationery (stamped paper), and the like, used or unused, other than those of heading 49.07.