Persons exempted from duties of postage

The following persons shall be entitled to have their letters free from postage, (a) owners, charterers, or consignees of inward bound vessels; and (b) owners, consignees or shippers of goods on board any inward bound vessel, however, (i) letters brought by any one vessel to any one such person shall not collectively exceed six ounces in weight, and the owner, charterer or consignee shall be described as such on the address or superscription; (ii) in the case of owners, shippers or consignees of goods, it also appears by the ship’s manifest that they have goods on board the vessel; (iii) if the master of the vessel shall deliver any such letter into the post office it shall cease to be privileged, and shall be liable to the full rate of