Try Founders Grotesk by Klim.

Founders Grotesk looks close but don't think it's the one, /t foot looking angular and horizontal like aforementioned Px Grotesk. /a does not look to match either. Reminds me another Grotesk, Radim Peško's F Grotesk.

I tried these two, but they don’t look “purposefully awkward” enough (for want of a better word) : look at the weird flat terminal on the lowercase a, and the perfectly round O…

“purposefully awkward”, that's why I instantly thought about Radim Peško. Jonathan Hares works with Nicole Udry at Communiqué and is referenced at Lineto as the designer of Superstudio so maybe it's one of its own creation.
Another sample: http://mikasavela.tumblr.com/post/95160223274/another-exhibition-in-the-...

Got it. I was lucky but after some digging (Jonathan Hares > Luke Archer > MAAD > RH Modest Beta > Robert Huber > Swiss Design Awards), should be Intermedium Text (? or Alta Demi Display?) by Robert Huber.

Reminds me of Proto Grotesk.

It's very close to Proto Grotesk, yes — but the figure 0 is perfectly round here (see “20th century”, third line). I think Ryuk got closer by working the ECAL network…
And since Alta Semi Display seems to be some kind of “lapidary” display font
(see pic below), my Grot must be Intermedium Text, indeed.