IMPERIAL AND FOREIGN POST
115
In addition to ordinary correspondence, they may contain paper valuables such as bank notes, currency notes, bonds and securities, also valuable documents of any kind such as plans, estimates and so on. But if the contents are dutiable in the country of destination they can only be sent to countries which admit dutia- ble articles by letter post (see page 85). Letters containing articles other than those mentioned above, postcards, small packets, printed papers, commercial papers and samples cannot be insured.
Make-up
An insured letter must be enclosed in a strong cover made up in one piece, which must be securely fastened by means of identical seals in fine wax, with spaces between, reproducing a private mark, and affixed in sufficient number to hold down all the folds of the envelope. An envelope with a black or coloured border or a transparent panel must not be used. The inake-up of every letter must be such that its contents cannot be got at without external and visible damage to the envelope or the seals.
Space must be left between the postage stamps on it and between the postal labels, if any, so that they cannot serve to hide injuries to the envelope. They must not be folded over the two sides of the envelope so as to cover the edge.
No labels may be affixed except those of the postal service. If the packet is tied round with string or tape, a seal must be placed on the ends where they are tied. The seals on an ordinary envelope should be placed as shown below:
A
A
(A)
A
A
In the case of a long envelope with a seam down the centre, the seam should be secured with seals placed not more than three inches apart.