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Letterfolds are ways of folding letters so that they can be posted without the necessity for envelopes. Letterlocks are additional folds, often depending on cuts, which are used to lock the letterfold together in an attempt to make sure it can not be read in transit.

Historically the most usual way of folding a letter seems to have been to fold in both long edges, although not necessarily to the point where they would meet, to form a long, narrow rectangle, to fold one short edge of this rectangle inwards to create a pocket, then to fold the other short end inwards and tuck it inside the pocket to form a stable package. A wax seal can then be used to ensure the package will not come apart. I call this the basic rectangular letterfold.

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312-13

A group of five almost complete letters written in the Sogdian language, each of which had been folded several times and bore the names of the sender and addressee on the outside, were found in 1907 by Sir Aurel Stein in Iran in a ruined watchtower on the Chinese frontier wall which formerly guarded the route between Tun-huang and Lou-lan. These documents are usually known as the Ancient Letters. They were once dated to within a few decades of the traditional date for the invention of paper in 105 A.D. and thus thought to be possibly the oldest paper documents in existence. Further consideration by scholars suggests that they are more correctly dated to the years 312-13.

Source: http://www.iranicaonline.org/articles/ancient-letters

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1502

The manuscript 'De Viribus Quantitatis' by Luca Pacioli which was written in or around 1502 gives a description of three ways to seal a letter without any wax.

a, 'Given a rectangular sheet of paper, one is to fold it widthwise so to obtain a strip of paper. Both ends of the paper are bent in such a way to obtain a similar trapeze standing out to each side of the strip. The side of the trapeze gives the next fold, which is to be folded over until both ends are close enough that after folding them into each other they form a square shape.'

This sounds similar to the Love Knot Letterfold but with the ends tucked in to form a square.

b, 'The second method is by far simpler. Start with a square paper. Fold it diagonally. Next, tuck one of the acute angled tips of the triangle formed into the fold of the other. The right angled tip is then tucked between them and possibly even secured by a single stitch where all of the tips overlap.'

c, 'Another method is to have the letter wrapped around a round piece of leather. It is closed. The way it is closed is not to clear. However, Pacioli, stresses that there are special tongues with rounded tips to crease the letter shut. Upon opening the crease marks will be obvious making it a hard task to restore the letter to shut state.'

It seems to me that the third method is a good description of the Chickenwire Letterfold.

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1528

Two examples of letters folded using the basic rectangular letterfold method can be seen in an engraving of Erasmus of Rotterdam by Albrecht Durer dated 1526.

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1584

There is mention of how to open letters and reseal them without arousing suspicion in 'Magiae Naturalis' by Giambattista della Porta (1535-1615), the first four books of which were published in Latin in Naples in 1558 and which was gradually expanded to twenty books by 1584.

(From Chapter XI of Book 16 - Of Invisible Writing)

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1596

An uncomplimentary popular song about Marie de Guise (later Queen of Scotland) suggested that she 'loves paper poulets as much as (poulets) in fricasee' - said to be a reference to love notes folded to resemble a chickens wings.

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1607

In or around 1607 Sir Robert Cecil, Secretary of State for King James I/VI wrote a letter to his teenage son William which includes the following passage:

'I haue also sent yow a peece of paper fowlded as gentlemen vse to write theire letters, where yours are lyke those that come out of a grammer schoole.'

This is clearly not very complementary to young William's folding skills. Unfortunately, while the letter has survived the exemplar has not.

Source: https://blogs.helsinki.fi/kaislani/2016/03/11/letterlocking/

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1636

'Deliciae physico mathematicae oder mathematische und philosophische Erquickstunden' by Daniel Schwenter, which was published in Nürnberg in 1636 contains a description of what appears to be a letterlock. The instructions appear to explain how to slit the folded paper and lock the halves together with a strip so no one can open it and read it, but the relationship between the text and the illustration is not very clear. Information from Edwin Corrie.

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1658

An English translation of 'Magiae Naturalis', under the title of 'Natural Magick', and giving the author's name as John Baptista Porta, was published in London in 1658 translates the Latin cited above as:

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The Square Letterfold - 1694 onwards

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Japanese Knotted Letters - 1723 onwards

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Japanese Folded Letters - 1736 onwards

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1759

'Onomatologia curiosa artificiosa et magica oder ganz natürliches Zauber-lexicon', which was published in 1759 explains a method of securely locking a letter:

Columns 256/7

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1819

'Leichte Künsteleien zum Vergnügen und zum Nutzen für Kinder und Nichtkinder' by Dr Heinrich Rockstroh, which was published by Ludwig Wilhelm Wittich in Berlin in 1819, contains a section headed 'Der geficherte Zuschluss' (The secure connection) which describes how to fold a letter that is more secure, and able to be more securely sealed with wax, than a standard folded letter.

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Three-Cornered Notes / Cocked-Hat Notes / Triangular Letter Folds - 1826 onwards

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1829

There are some interesting comments on the complex folding of notes in 'The Young Lady's Book', which was published by Vizetelly, Branston and Co in London, in 1829.

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1833

The paragraph mentioning 'folded and perfumed' love-billets below appeared in a story called 'The Maid's Stratagem' in The Lady's book (aka Godey's Lady's Book) of March 1833.

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1876

The Cahier de Adele Tissot, which can be dated to 1876, contains a folded example of what appears to be a Basic Rectangular Letterfold, except that it is called 'Le Sachet' and thus appears to be intended to function as a container of some kind, perhaps?

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1915

'Occupational Therapy: A Manual for Nurses' by William Rush Dunton, which was published by the W B Saunders Company in Philadelphia and London in 1915, contains a description of how to fold a simple envelope (which is not self-sealing).

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1932

A method of folding a love letter appears in 'Winter Nights Entertainments' by R M Abraham, which was first published by Constable and Constable in London in 1932.

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1949

A way of folding a letter into a 'Lettre Sans Enveloppe' appears in 'Au Pays des Mains Agiles', which was published by Editions Fleurus in Paris in 1949.

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1951

The extended version of 'El Mundo de Papel' by Dr Nemesio Montero, which was published by G Miranda in Edicions Infancia in Valladolid in 1951, contains a design for a letterfold derived from The House titled 'Papel y Sobre' (Paper and Envelope)

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