Insured value

(1) The amount for which an article is insured must be written in ink by the sender or his representative both in words and in figures, at the top of the address side of the cover as followsInsured for ..................... dollars ($ . . . .). (2) No erasure or other alteration of this inscription is allowed. A postal packet may not be insured for more than the maximum sum appropriate for the country to which it is addressed. Within such limit it may not be insured for a value exceeding the market value of the contents and the packing. (3) An item may be insured for part of its value. Also, where the contents have no monetary value, it is permissible to insure for a nominal amount in order to obtain the safeguards of the insurance system.