Released by Klingspor in 1927–30. [Reichardt]
Comes with round alternates for a number of caps incl. ‘AEFKMNR’.
Monotype’s copy for the American market was called Sans Serif and was nearly identical until it added several alternate characters mimicking other popular geometrics like Futura and Bernhard Gothic. [McGrew]
Bistream’s version is Geometric 231.