Every package of cigarettes shall, before removal subject to tax, have adequately imprinted thereon, or on a label securely affixed thereto, the designation ``cigarettes'', the quantity of such product contained therein, and the classification for tax purposes, i.e., for small cigarettes, either ``small'' or ``Class A'', and for large cigarettes, either ``large'' or ``Class B''. (72 Stat. 1422; 26 U.S.C. 5723)