Does anyone knows what font is this?
Thanks in advice for helping me!

Swiss721 Rounded bold  Suggested by tophy52 

As far as i can see,
on this image,
http://twitpic.com/2mechc

with an 'f' and a 'y' like this
could be
Arial Rounded bolded and enlarged,

Frankfuter
http://new.myfonts.com/fonts/letraset/frankfurter/
but the 'f' is too curvy

Swiss721 Rounded bold
http://new.myfonts.com/fonts/bitstream/swiss-721/bold-rounded/

Chevin Bold
http://new.myfonts.com/fonts/fw-g-type/chevin/bold/

Many thanks for Your help!
Yes, this font is very similar to Swiss721 Rounded bold.
Have a nice day!