System Cado suspended sofa?  

I would love to know this as well.
I collected Cado pieces in Rosewood for many years and always dreamed of finding the sofa.
There are a few other catalog pictures as well i believe of it, but never saw one in the wild.

I notice looking at the catalog image that the cantilever is far more cross grained than is wise. Such a construction is weak. The side rail could snap. The rear joint is very long, and subject to wood movement problems especially in rosewood, which is not very dimensionally stable. This could lead to failed glue bonds. (For instance the front legs of the Pia chair are attached to the seat rails with wide finger joints, and this glue bond quickly breaks, even though it is much narrower than the sofa, fortunately the front rail mechanically locks it together so the chair does not fall apart). Also, the wall standards are not very thick and often not attached to the wall in such a way as to hold a heavy person at then end of a 28 inch lever. I could easily imagine a tendency for installation problems. Either the rails pulls off the wall or it breaks right above the sofa.
My point is simply that I imagine there might have been a high 'mortality rate' on this component. And I would guess it was already expensive and a slow seller.

Here is the original mounting instructions for the sofa, seems like they secured it pretty well.
But i am with you Leif, they most likely scrapped the idea after having problems with them.
Otherwise you would think that at least one of the would turn up after all these years.
I was actively looking for one for many years, but if someone have seen one or have one i would also love to know!

Not sure why the picture came out so blurry.
But it basically says that the sofa should only be mounted in the wallpanels and not the wall rails or telescope rails.
Also, there have to be a wider mounting wood plate (dont know the word in English) behind the panel than normal, ca 65cm above the floor since once placed on the panel, you should drive two long screws through everything to secure that the sofa does not pop out from the wall.

Well that also partly explains why it is so rare: the paneled wall System Cado purchases were a fraction of the total purchases because of the added expense.
Thank you for he installation instructions. Very interesting.
And there is still a hidden mounting problem, at least in the USA. Most houses are wood frame, with studs (wooden vertical posts inside the wall) spaced at 16 inches measured from the centers of the studs. The Cado/Royal System wall units are designed with a 31.5 inches width, which is 0.5 inches short of the 32 inch span of two studs. So most of your mounting screws are anchored into drywall, which are weak compared to hitting a stud. This is not a problem for normal shelves etc. It is a problem for how they show mounting the sofa. One would want that support board nicely lined up with a stud at either end, and one in the center, but you are virtually guaranteed only two studs to anchor it to somewhere nearer the middle. This is really not strong enough considering the force a large human exerts when perched on the edge of the sofa.

Not realy true over here, or in Sweden at least.
Over here about 60% of all Cado systems i have seen have been the rosewood version with the full wall panels.
Those were the only ones i collected but had a few other versions as well.
I am not sure if you are familiar with how the wallpanels are mounted Leif, but you should first mount 4 studs vertically on the wall, secured in the studs inside the wall.
Then you mount and secure the panels in these vertical studs, and if you were to mount a sofa you should use the extra wide stud second from the bottom.
That way you will always have a secure anchor point for the panel moounting screws.

In the USA the wall panels are definitely less common, and teak is much more common. I am guessing that wall studs in Sweden are spaced every 400mm (40 cm)? This would line up perfectly with the 31.5 inch width of a Cado bay. Here in the USA the distance is just slightly more so the bays do not line up with the studs inside the wall.

Its the other way around here then i guess, maybe it was to costly to ship those large panels abroad.
I am not sure if you read what i wrote above about the mounting for the panels?
They do not mount onto the studs in the wall (spaced every 60cm by Swedish standards by the way), instead you have to mount vertical studs outside onto the wall that the panels mount to.
Can upload the original mounting intructions later tonight,

Yes, I think I understand. The problem is what you attach those vertical wall system studs to inside the wall. In the USA there is nothing but air behind the drywall where those cado studs land, because they do not line up with the pine 2x4 wall studs. So you are attaching the whole wall unit to drywall gypsum. This is fine for a normal installation but not so good for a sofa.
I am always interested to see vintage documentation of any sort!

You attach the vertical studs to the evenly spaced studs inside the wall, thats the whole point.