IMPERIAL AND FOREIGN POST
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The material for private cards to be used as post- cards must be ordinary cardboard or paper not less than one hundredth of an inch thick and not more flexible than that used for postcards issued and sold by the Post Office.
The right-hand half at least of the address side is reserved, for the address of the recipient and any neces- sary postal service indications, for example REGISTERED, ADVICE OF DELIVERY, and the postage stamps' must be affixed in the top right-hand corner of this portion.
The remaining space is available for the use of the sender for written communications or for attaching illustrations, photographs, stamps, labels and cuttings. All such attachments must, however, be of paper or other very thin substance and must adhere completely to the card, while stamps liable to be mistaken for postage stamps must be affixed only to the back.
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A sample of merchandise or other similar article may not be attached to a postcard.
An address label or a slip to fold back, completely adherent to the card and bearing the name and address of the person to whom the card is sent, may be affixed to the address side of the card.
Postcards must be sent unenclosed, that is without wrapper or envelope.
Any postcard which does not comply with the fore- going conditions is treated as a letter.
A single postcard posted unpaid or insufficiently prepaid is forwarded and charged on delivery with double the amount of the deficiency.
An unpaid or underpaid postcard from abroad is charged on delivery with double the amount of the deficiency, the minimum surcharge being 5 cents, and 2 cents from China and Macao.
REPLY-PAID POSTCARDS
In addition to conforming with the foregoing regulations for postcards, reply-paid postcards of private manufacture must bear at the top of the face of the first half the words CARTE POSTALE AVEC REPONSE PAYEE and in a similar position on the second half CARTE POSTALE: REPONSE. They should be made up in such a way that when one half is folded over the other,