DIN Cond Med

http://www.myfonts.com/fonts/linotype/din-next/
is close but the waist on _R_ is too low, center vertex of _W_ is level with the outer strokes, and there are other differences.
Don

Loft Light http://www.myfonts.com/fonts/mti/loft/ is close but the center vertex of _M_ is on the baseline and center vertex of _W_ is level with the outer strokes, and there are other differences.
Don

Driver Gothichttp://www.myfonts.com/fonts/canadatype/driver-gothic/ but the _I_ has serifs, and there are other differences.
Don

FF Confidential.

- Lex

Good find Lex!
I wonder what Just van Rossum used as his source.
Don

It's always reminded me of these plastic lettering templates I had as a kid.

- Lex

Could explain the naive mechanical shapes of the letters. Would have needed a stencil with narrow letters.
Don

The closest smooth letter equivalent of FF confidential could perhaps be Corpa Gothic Bold
http://www.myfonts.com/fonts/brassfonts/corpa-gothic/
Don