Chances are it's hand lettered using a template, most technical drawings are hand lettered / template lettered.

I'd suggest Simpliciter Sans

DIN16 should do as well.

Edit: FF DIN comes close actually...

Good call, Asvetic. Another rounded, template-based option would be Gravur Condensed from Lineto.

http://lineto.com/The+Fonts/Font+Categories/Text+Fonts/Gravur+Condensed/

Try Gotham Rounded.

or Bryant

...modeled around the popular Wrico lettering kits used by draftsmen and amateur sign makers in the 1960s and ’70s...

Or DIN 17. I do not know 16, Vincent. Can you show?

Chevin - like a more characterful, rounded Din.

Nick Cooke

Stephen, I couldn't find a link on FontShop nor MyFonts. I did find it under FontFactory. There is also an old thread on Typophile. Can't seem to find a purchase link I'm afraid...

Ahh, funny that I recommended 16 in that thread. 2003 -- so long ago.

Mecanorma is sadly in trademark limbo. Cannot purchase ahora.

Think I got it from a friend back in 2000–2001. Wanted to get my hands on any fonts that were clean & geometric after having used several letter rulers in Secondary school. Just loved setting them on paper with a traditional pen!