Every package of cigars shall, before withdrawal from the customs warehouse under this subpart, have adequately imprinted thereon, or on a label securely affixed the words ``Tax-exempt. For use outside U.S.'' or the words ``U.S. Tax-exempt. For use outside U.S.'', except where a stamp, sticker, or notice, required by a foreign country or a possession of the United States, which identifies such country or possession, is so imprinted or affixed. (72 Stat. 1422; 26 U.S.C. 5723)