Section 21 WORKS OF ART, COLLECTORS PIECES AND ANTIQUES 97 WORKS OF ART, COLLECTORS' PIECES AND ANTIQUES. 97 04 THOSE OF HEADING 49.07. 97 04 00 POSTAGE/REVENUE STAMPS,STAMP-POSTMARKS,FIRST-DAY COVERS,POSTAL STATIONERY Commodity Code Description 97 04 00 00 POSTAGE/REVENUE STAMPS,STAMP-POSTMARKS,FIRST-DAY COVERS,POSTAL STATIONERY