Talk Talk – “My Foolish Friend” single cover
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What does the “m” stand for? Is it mittelshrift? Was there also a Din 16 condensed?
The m with over- and underline stands for Micronorm. Here’s a definition from D. Simmonds, Charts & Graphs. Guidelines for the visual presentation of statistical data, 1980:
An ISO (International Standards Organization) standard for draftsmen which controls use of letter forms and line thickness when preparing artwork for microfilming.
(a) Stroke width of lettering is 1/10 of the letter height
(b) Differences between letter heights are controlled by the proportion of 10:7 which gives a multiplication factor of 1.4. All lettering sizes are determined from a starting point of 10 mm
(c) Rules apply to line thicknesses and the standard range consists of nine line widths as follows: 0.13, 0.18, 0.25, 0.35, 0.5, 0.7, 1.0, 1.4 and 2.0 mm.
These 9 line widths were color-coded for easier use (Violet, Red, White, Yellow, Brown, Blue, Orange, Green, Gray), on technical pens like the Rapidograph and elsewhere. The depicted Letraset sheet has “orange” glyphs, i.e. their size is 10 mm, with 1.0 mm line thickness. See also the Wikipedia entry on ISO 216 which mentions the technical drawing line widths specified in ISO 128, and the matching technical pen widths as specified in ISO 9175–1.