Hamilton Manufacturing Co. cut the Unit Gothic series in seven widths. This design is characterized by minimal modulation in stroke width and angled terminals. No. 720 is 50% narrower than the standard width No. 718. Here’s the description of the usefulness of the Unit Gothic series from Wood Type by Hamilton, Catalog 38, 1938:
All characters of the same size in any of these seven widths are on uniform bodies with the exception of caps M, W and I, and lower case letters i, j, f, l and t.
This series of Unit Gothics will be found invaluable in the production of artistic posters as it embodies an even and gradual reduction in widths. If a line set in type of one width does not fit the space available, another width of the same size will always be right.