I just bought a set of 4 dining chairs. their design is quite interesting to me, and the fabrication shows a lot of different details.
They are stamped "Made in Denmark", and also have a red mark underneath the seats.
I found some similar models online that were apparently sold by Ann Christensen Boligmontering.
Plywood backrest. Very dark patina but probably made out of Walnut and oak or birch wood.
@emile. Attaching an image of a vintage advert showing the Soro mark ( also shows the other more recent mark).The chair in the image is designed by Henning Kjaernulf. I have found one set of your chairs where the seller attributes them to Henning Kjaernulf, but you would need to find documentation to confirm this.
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