Shown in Lettergraphics’ 1968 catalog in 16 styles including three weights and a Thinline (with higher contrast), a Moditalic, plus Biform, Outline, Contour, and Shadow variants. In addition to the enlarged lowercase forms for ‘AEJMNRU’ (in some styles also ‘I’), there are many alternates including for ‘fjkrtyKR’.
Ten styles are shown under the alias Ibsen in Castcraft’s Encyclopedia (1978).
California Grotesk is very similar, but distinguished by a bearded ‘G’, a tailed ‘a’, a non-bracketed roof in ‘t’, and square instead of round dots.