No foreign letter or parcel shall be accepted at any post office for insurance if it is so small or so covered with writing or sealing wax on the address-side, or otherwise made up in such a manner, as to render it impracticable to affix to it the official labels prescribed by the Director General.Explanation. - This rule shall not apply to a letter, or parcel which has an address label tied to it, provided that the label is not so small or so covered with writing on the address side as to render it impracticable to affix to that side the official labels prescribed by the Director General.
