Hello
Similar:
http://www.whatfontis.com/Allumi-Std-Extended-Heavy-typofonderie.font?te...
Alex
I found it using: http://www.whatfontis.com - Identify the font you are looking for!

Thank you for helping and it is maybe a bit similar but still not like the logo the O looks quite different for example.

Maybe it is custom made, but does anyone have a clue?

???

I'm sorry, I don't know any font with such a /O but I can't state it's custom made. May be it is as simple as "generic extended sans like Helvetica/Akzidenz Grotesk with a custom /O".
What I can propose though:
- the logo itself, freely available to download as vector: http://www.brandsoftheworld.com/logo/only-denim
- some similars: Foundry Monoline, NeoGram, Sui Generis (which comes very close, for the /NLY part at least), Forza
- a possible track to follow: have a closer look to the /® (register mark), the external circle and /O look like to share the same design. /R reminds me once again of Foundry Monoline. So my last call: custom job based on Monoline.

I agree that the |R| in the ® symbol is the least likely part being customised, so the most likely clue to find the original font.

Thanks guys for you help it properly is custom made, but i've got some good alternatives ;)