Unknown sofa bed with unique arm structure  

Hi Everyone

I picked this sofa/bed in the weekend that is in pieces as a project see photo of  slightly unusual arms.

The seat area uses 23 expersprings and it has a slatted back with 17 vertical slats (coincidentally both prime numbers) and includes the metal fold down feet.  The arms are a bit different and I cannot find anything similar and I thought this might help on the ID.

I took it to a local restorer for his advice on ID and he was fairly sure it was Danish based on craftsmanship and weight/density of timber, but he could not help on the manufacturer or designer. I have looked all over for any marks and cannot find any. It has been sanded by the previous owner.

Any help would be gratefully received

Regards John