Folding Antimott Chairs by Ulrich Hermstrüwer for Wilhelm Knoll, 1950s, Set of 2

Very rare folding chairs from Wilhelm Knoll.
Model Antimott. Design Ulrich Hermstrüwer 1954.
Both chairs were reupholstered with a matching fabric a long time ago. Beech wood frames are original with slight signs of wear.
The folding mechanism works very well.
The chairs are clean, stable and complete. This piece has an attribution mark,
I am sure that it is completely authentic and take full responsibility for any authenticity
issues arising from misattribution