You mean something like this?
http://new.myfonts.com/fonts/jonathan-hughes/fyra/

Well, the letters aren't inscribed in squares, but I quite like Frutiger Stones.

Whitney Index

thank you all, but I was looking for something more old fashioned, like this

I think that the one in your sample is just a graphic contruction using a "normal" typeface.

for sure, and I'm afraid nothing similar exists as typeface...

(At least in the case of Gill Sans,) the boxed version of a font is called "Cameo."