Ib Kofod Larsen #544-15 "Spear"  

Stained beech. The early chairs did not have Selig medallions. There will be a cinch tight seat frame under the cushion. (That is my name for it: there are holes the straps to through and get cinched tight against themselves).
The chair also has not seen any sunlight, so the "saddle" stain has not faded and turned greenish. If you keep it out of the sun for the next 50 years you will have a peerless museum specimen.
The cushions should have latex foam in the per the Selig catalog, in the very possible case you need to replace the foam. New pirelli rubber straps can be purchased on ebay by the foot.

Thanks so much Leif, how to fit so much information in what I can imagine is only a totally normal sized head! I have an abnormally large head just mostly empty. But yes the chair has the dowl tensioners, as far as the cushions go they are disintegrating pretty well leaving yellow all over. Do you have any idea as to the back pillow vs actual cushion thing?

It's hard to read due to the dark upholstery and b&w photo, but it appears to me that there is a back cushion shown on the chair on the right page, and the first chair on the left page.

And maybe this is just me reaching but the one with the back to us looks like it's not a full size back cushion.

I would strongly guess that the back cushion is original based on the condition of the chair. And it does appear that the catalog shot with the chair's back to us does show a cushion the same smaller size.

Did they make this chair in a light stained beech or natural beech? Researching this chair recently, I have notice light and darker stains on these Ib Kofod Larsen #544-15 "Spear" chairs.
Peruche