Letter sheet
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In philatelic terminology a letter sheet, often written lettersheet, is a sheet of paper that can be folded, usually sealed, and mailed without the use of an envelope, or it can also be a similar item
Opened up 1628 lettersheet showing folds, address and seal, with letter being written on the obverse
A used 1840 hand-coloured 1d Mulready stationery envelope mailed to London
An 1886 2¢ Grant letter sheet uprated by 2¢ and used to Germany, 1888. The letter and flaps were folded for mailing. (Side flaps are still present as they were not torn off upon opening.)
Iraq airmail letter card issued in 1933
Postal stationery
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A piece of postal stationery is a stationery item, such as a stamped envelope, letter sheet, postal card, lettercard, aerogram or wrapper, with an imprinted stamp or inscription indicating that a spec
Letter sheet
…sealed (most often with sealing wax in the 18th and 19th centuries), and mailed without the use of an envelope, or it can also be a similar item of postal stationery issued by a postal authority. Letter sheets derive from the form in which written correspondence was made up before the mid-19th century—letters were…
UK letter card of 1892 with an imprinted stamp and perforations.
U.S. postal card of 1881 with an imprinted stamp.
A Bavarian postal card of 1895 with an imprinted stamp.
Cuban postal card of 1878.