From The Foundry website:
Foundry Gridnik, described as 'the thinking man's Courier', derives from a typeface that was originally designed by Dutch designer Wim Crouwel in the late 60s, as a single weight typewriter face, but it was never released as a font. A modified version of it can still be seen today in Crouwel's 1976 designs for the low-value postage stamps of the ppt, Dutch post office, which feature the stamp value only, displaying the numerals to full effect. The Foundry has named the typeface Gridnik because of Crouwel's devotion to grids and systems in his work to create visual order; he was often affectionately referred to in the 60s as 'Mr Gridnik' by his friends and contemporaries.