Drawn by Eric Gill in 1932 and issued by Monotype in 1936. Different enough from the rest of the Gill Sans family to deserve its own family entry. Gill initially called the design Double Elefans. Released as Kayo, derived from “KO” (i.e. knockout in boxing). Later known as Gill Sans Ultra Bold (Series 442). [Rhatigan]
Digital versions include Gill Sans UltraBold and Gill Sans Nova Ultra Bold (Monotype), Humanist Sans 521 Ultra Bold (Bitstream), and Klassik Sans No. 2 Ultra Bold (URW).
A condensed was added in 1980 by Letraset. It is available in digital form from ITC (as Gill Kayo Condensed) and Monotype (as Gill Sans Condensed UltraBold).