Set of 8 vintage dining chairs in beech wood

Set of 8 decorative dining chairs in beech wood with a rush seat. The chairs have a folding - shaped look, but are not foldable. The honey colored wood had gained a nice patina over the years. Underneath the seat you can find the original flat slot screws and blots. The set was found in an architectural house and dates back from the late 60s. So far, I could not find the designer or manufacturer.