Analysis of information sources in references of the Wikipedia article "Tempo (typeface)" in English language version.
McClatchy Sans takes a number of design cues from Tempo, R. Hunter Middleton's Americanized take on the geometric sans, which seems to borrow as much from sign painter's Gothics as it does from Futura.
Tempo Alternate was designed to look more like Futura than the original release of Tempo. They failed pretty miserably; only a blind man could confuse this for Futura Bold.
Stellar and Tempo, released in 1929 and 1930, respectively...both have the Erbar a
Tempo has a fun mix of Futura's teutonic sternness and R. Hunter Middleton's love of lively quirks. Middleton worked in a backward leaning f, a curvaceous style for v, w, and g, and big open apertures for e and s that resemble American advertising letters of the era.
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