Air and Sea Mails consists of Letter Post and Parcel Post Items.
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Letters Post Items being subdivided into the categories of:
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Letters:
Anything having the character of current and personal correspondence and
posted at the letter rate.
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Postcards:
Cards posted unenclosed that is to say without wrapper or envelope.
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Printed Matters:
Reproduction on paper, cardboard or other material commonly used in printing produced in several identical copies by means of a mechanical or photographic process involving the use of a block, stencil or negative.
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Literature for the blind:
Letters bearing writing used by the blind posted unsealed and plates hearing the characters of writing used by the blind.
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Aerogramme:
It is a light letters forms. No aerogramme shall be accepted in Brunei Darussalam for transmission unless it has been issued by Postmaster General. No enclosure whatsoever is permitted in any aerogramme.
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Parcel Post Items consist of Small Packet (Ordinary Parcel Items).
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Air and Sea Mails act as an ordinary items, but they can be registered and insured items.
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Ordinary or Insured Air and Sea Mails are considered as recorded items and can be claimed due to loss or damage.