Designed by F.W. Kleukens and released by Stempel as Ratio-Latein (two weights) and Ratio-Kursiv in 1923, followed by a set of open caps, Lichte Ratio-Versalien (1924), and a third heavy weight (1926). Polish foundry Idźkowski had a version named Modena (previously named Aspazja Jezynskiego), in four styles (antykwa, kursywa, pólgruba, gruba) [Reichardt 2011].
Revived by Griffin and King as Ratio Modern (Canada Type, 2011, used for sample). The digital version includes all styles except for the open caps. The upright regular weight has small caps.