Georg Salden originally developed his groundbreaking sans-serif between 1972 and 1976 for his own GST (Georg Salden Types). It was “digitized by hand between 1989 and 1992 on the Ikarus system [and] expanded.” — Luc Devroye
Today, the Polo family as offered in OpenType by TypeManufactur spans 5 weights with Italics, each available in 3 optical sizes. Further, there are Cyrillics, (upright) small caps, 2 display cuts (Fino, Extralight), 10 condensed, 8 narrow and 2 extracondensed styles.
Not to be confused with Polo (Typoart).