We have stumbled upon a treasure!
A set of 4 arm chairs designed by Warren Platner!
"Originally introduced by Knoll in 1966, the Platner Collection is an icon of modern furniture. Platner personally formulated the production techniques for the complicated designs with each chair requiring over a thousand welds and more than one hundred cylindrical steel rods. Knoll also introduced an executive private office collection designed by Platner."
Direct from the Knoll website.
The chairs are in wonderful condition, although they were missing the original upholstery when we found them. We have since brought them back to life, adding to the classic look with an updated grey velvet upholstery.