Designed by the Swiss manufacturer CaractèresS.A. [1960, 1967 trademarks] and used in typewriters such as later models of the Olivetti Lettera 22 and Studio 45, and the Facit TP1 and TP2.
Similar slugs were used by other typewriters from Swissa and Adler. The Hermes 3000 had a similar design called Techno, and the Olympia SM9 had one called Senatorial with much sharper corners. [Ramos, Fountain Pens & Typewriters]
Digitally interpreted by Cornel Windlin as FF Magda.