Need help to identify maker - teak sofa - possibly Grete Jalk  

It isn't France and Søn. There are literally only a handful of their pieces that aren't marked. And this one isn't one of theirs anyways. 
I strongly doubt it is Grete Jalk. Looks a bit derivative of Finn Juhl's japan sofa, unfortunately. I have seen this sofa somewhere before....

Maybe I haven't seen this sofa before. I am thinking if these Hans Andersen chairs that are quite similar:
http://www.dejavulongbeach.com/sold-items/pair-of-easy-chairs-by-hans-an...
You might discover there is something to the similarity with a bit of research. Or it could be nothing. 

Hi there I have the exact sofa as you and requested an id some time back but no one could figure it out. My sofa has single piece sprung cushions and a small made in Denmark in gold letters on the inside front of the sofa. I am sure it's a france and sons piece given all the similarities to jalk and others. But attributing a designer I have not been able to do. As Leif stated the long rounded back pole is reminiscent of Jhul's japan series.

"BRUN" means "BROWN" in danish. And like in english it could either be a name or a color. My guess is, that it is the name of a previous owner. The sofa looks to be in solid teak, and I believe that colorcodes where merely used when staining cheaper woodsorts like ex beech.
The numbers doesn't ring a bell.
I too have seen this Juhl/Jalk crossover design before, but I can't recall where. It's very likely that none of the two actually designed this one.
 
@ hoopsie
Do you have a picture of the gold letters?

I second the request to see the gold letters.
I have a lot of France and Søn pieces, including two Jalk sofa, as well as a France and Søn catalog, access to scans of another, and catalogs for half a dozen France and Søn retailers.  I would never suggest that I can not be wrong, and would happily entertain the theory that I am wrong, but I really don't think this is a France and Søn piece
I suspect that if you take detail photos I can point out a multitude of differences compared to France and Søn production. 
E.g.
Hex screws and sockets that hold the sides on the sofa
Ends of the front rail should have beech dowels set vertically into the rail.
Metal tabs connecting the seat to the back.
There should be an indentation in the wood in a specific place in relation to the gold paint filled stamp. 
And I could go on....
(The fact that there are now two of these without France and Søn markings should be sufficient proof that this isn't France and Søn.  The company was one of the very, very few Danish companies that was extremely reliable about marking product.)

Hi guys here is a photo of the made in demark mark, also my sofa has no hex screws and the tabs connecting sofa seat to back is all wood. This sofa has a lot of similarities to my jalk arm chair, not saying it's a jalk design but based on construction, form, looks etc I have a stong feeling it's a france and sons piece? Could it be an in house piece?

Thanks for the picture Hoopsie
The lettertype (font?) and the fact that it's all written in small letters could suggest that it's France & Søn/France & Daverkosen. Of course it's only an indication, as several manufacturers could use this font type.
The obvious thing missng in the picture is of course the emblem/logo. As far as I can tell from the picture, it has never been there.
As far as I recall (I could be wrong) Fr./Daverkosen Fr./Søn always had a logo as part of their imprint/emblem. But I have found out that CADO, (who took over France & Søn 1966), as opposed to earlier marking, used paper stickers for some of their furniture. I got this information from a danish book "Den store danske møbelguide". I don't recall actually ever seeing these paper stickers.
CADO used the same type of font for their "made in denmark" imprints as in the France days. If a paper sticker was used for the CADO logo, it might simply have fallen of.
Of course, none of this is any definite proof of origin.
EDIT
Almost forgot. The gold letters. Was also often used in the imprints on the France/CADO furniture. (first pic. below)