Hard to tell from only four letters, but Dejavu Pro is a possibility:
http://www.myfonts.com/fonts/dutchfonts/df-dejavu-pro/

The ear on the g is not right for Dejsvu Pro,

Well, I'm not sure about Dejavu Pro.
Here's another shot!

There does appear to be more of a upward curve to the spur on the sample.

If you have a better suggestion, by all means....

I think this Akkurat from Lineto

Sorry, Joel, still no match.

Can you tell me if the sample is from a printed piece or a web site (if the latter, can you share the URL)? Do you know the year of publication? The country? All those details can help narrow down the search.

A sample of more than six letters would also be helpful, if it's available.

Les, Akkurat looks right for "page" and "b", but the 1 doesn't match (not even the one in Akkurat Mon0):

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

Akkurat is close but not it.

The "l" from Akkurat mono does, though.

Birdseeding, you are absolutely right. Les, I think you nailed this one (the sample is Akkurat Mono, despite what the dialogue box says):

Akkurat Mono is the answer!
Thanks a lot for your help! You rock!

Mono it is - good eye Johan,