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Once upon a time, long before there was e-mail and long long before Twitter, What's App etc., when not anybody had a telephone urgent messages were sent by telegram. The text was sent via telegraph lines, typed on stripes by a machine and then the stripes sticked on a form. This was then brought to the adressee by a courier. The font is 'Courier New'. It's a such-called non-proportional font, which means all characters take the same space.