Perhaps different weights of Drescher Grotesk
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Life was frugal for designers (and everyone else) in the GDR. Typeface licenses were very expensive and with little money available to pay for them, type designers were instead ordered to design their own version by state publication authorities. Drescher Grotesk, originally designed by Arno Drescher around 1932 and redrawn by Karl-Heinz Lange as Super Grotesk at VEB Typoart (the state-owned type foundry), was the East German response to Futura.
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Source:
http://wwnorton.tumblr.com/post/37262931239/fonts-and-the-valley-of-unkn...
Digital revival:
http://www.myfonts.com/fonts/bitstream/drescher-grotesk-bt/
Don

See also FF Super Grotesk: http://fontsinuse.com/typefaces/96/ff-super-grotesk

Thanks you nailed it! Also thanks for the history note. Very helpful.