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Rh and commercial documents originating in one of the countries of the Union and intended for another of those countries. They shall also apply to the exchange by post of the articles above mentioned between the countries of the Union and countries foreign to the Union whenever such exchange takes place over the territory of two at least of the contracting parties.

The general Union rate of postage is fixed at 25 centimes for a single prepaid letter.

Nevertheless, as a measure of conversion, the option is reserved to each country, in order to suit its monetary or other requirements, of levying a rate higher or lower than this charge, provided that it does not exceed 32 centimes or go below 20 centimes.

Every letter which does not exceed 15 grammes in weight shall be considered a single letter. The charge upon letters exceeding that weight shall be a single rate for every 15 grammes or fraction of 15 grammes.

The charge on unpaid letters shall be double the rate levied in the country of destination on prepaid letters.

The prepayment of post-cards is compulsory. The postage to be charged upon them is fixed at one-half of that on paid letters, with power to round off the fractions.

For all conveyance by sea of more than 300 nautical miles within the district of the Union, there may be added to the ordinary postage an additional charge which shall not exceed the half of the general Union rate fixed for a paid letter.

The general Union rate for legal and commercial documents, patterns of merchandise, newspapers, stitched or bound books, pamphlets, music, visiting cards, catalogues, prospectuses, announcements and notices of various kinds, whether printed, engraved, lithographed, or autographed, as well as for photographs, is fixed at 7centimes for each single packet.

Nevertheless, as a measure of conversion, the option is reserved to each country, in order to suit its monetary or other requirements, of levying a rate higher or lower than this charge, provided that it does not exceed 11 centimes or go below 5 centimes.

Every packet which does not exceed 50 grammes in weight shall be considered a single packet. The charge upon packets exceeding that weight shall be a single rate for every 50 grammes or fraction of 50 grammes.

For all conveyance by sea of more than 300 nautical miles within the district of the Union, there may be added to the ordinary postage an additional charge which shall not exceed the half of the general Union rate fixed for articles of this class.