“Sans Serif is […] the unimaginative name for Monotype's extensive series which began as a copy of […] Kabel […] Koch's face appeared about 1927, with Monotype copying the Light and Bold in 1930. These two weights and their italics are virtually exact copies of the originals. Over the next three years Sol Hess designed a number of variations for Monotype, which differ more or less from their German counterparts, especially in the heavy weights. Light Condensed, Medium, Medium Condensed, Extrabold and Italic and Condensed, and Lined filled out the family. ¶ From this point Monotype went on to explore a new dimension in type design with the introduction of a novel idea in alternate characters. By the substitution of a dozen characters, more or less, for those in the standard font, the Monotype user could have “three type faces from one,” as the advertising said. With one set of alternates, available for most members of the family and designated H91 (suffixed to the series number), Sans Serif could be transformed into an approximation of Futura; another set (H92) contained the round capitals then popular. A set for Sans Serif Bold suggested Bernhard Gothic Medium (H9), while a somewhat similar but maverick set was made for Light (H93). The various condensed faces include aegjtu alternates, comparable to H91 […]” [McGrew 1993]

The sample shows the Medium weight with the alternate ‘S’ from he H92 set. See Sans Serif Lined for the all-caps inline style.