Please, help me to identify this font!
Thank you all in advance

Tzaristane  Suggérée par Menhir 

Not a 100% match, but can do the job.
Helvetica Neue : http://new.myfonts.com/fonts/adobe/helvetica-neue/helveticaneue-ultralight/
Or Gotham Thin : http://typography.com/fonts/font_overview.php?productLineID=100008

Tzaristane

the 'a' of Tzaristane is really weird.

... the "a" of the sample to.

Thank you all!
I think I was searching all the time for "Helvetica Neue Ultra Light" - and finally got the name!