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JAN TSCHICHOLD: Envelope for advertising matter. Red on white. Reduced.
WINDOW ENVELOPES
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To avoid repeating the address on the envelope and to make putting a let
ter into a wrongly addressed envelope imposstble. window envelopes are
used. whose sizes are laid down in Standard 680 (see reproduction).
The common envelopes with rounded windows should be replaced by win
dows with square corners.
If the standard letter is folded in the simplest way - once across and once
longways - the corresponding window envelope must have a horizontal
window. Since this is not yet agreed by the Post Office. the less convenient
triple fold as shown in 0 IN 676 is necessary.
The postal address of the sender appears in the standard window. so it is not
absolutely necessary to print it on the envelope. But if the sender wishes to
make his envelopes recognizable. the firm's address can of course be printed
outside. Example: Ta petenhaus Ruhl.