5. Packets of samples of merchandise may not contain any article having a saleable value; they must not exceed 350 grammes in weight, or measure more than 30 centimetres in length, 20 centimetres in breadth, and 10 centimetres in depth, or, if they are in the form of a roll, 30 centimetres in length and 15 centimetres in diameter.

6. Packets of commercial papers and printed papers may not exceed 2 kilogrammes in weight, or measure more than 45 centimetres in any direction. Packets in the form of a roll may, however, be allowed to pass through the post so long as they do not exceed 10 centimetres in diameter and 75 centimetres in length.

7. Stamps or forms of prepayment obliterated or not, as well as all printed papers constituting the sign of a monetary value, save the exceptions authorised by the Detailed Regulations provided for in Article 20 of the present Convention are excluded from transmission at the reduced rate.

1. The articles specified in Article 5 may be registered.

The reply halves of reply-paid post cards cannot, however, be registered by the original senders of such cards.

2. Every registered article is liable, at the charge of the sender:

3. The sender of a registered article may obtain an advice of the delivery of such article, by paying, at the time when he asks for such an advice, a fixed fee of 25 centimes at most. The same fee may be charged for enquiries concerning registered articles, if the sender has not already paid the special fee for an advice of delivery.

1. Registered articles may be sent marked with trade charges to be collected on delivery between countries of which the Administrations agree to provide this service.

These articles are subject to the same regulations and rates as registered articles.

The maximum trade charge which may be collected on any one registered article is fixed at 1,000 francs or at the equivalent of that sum.

2. In the absence of any contrary arrangement between the Administrations of the countries concerned, the amount collected from the addressee is