Marcel Breuer (Hungary/usa 1902-1981)
First edition model b34 cantilever chair from the 1920s/30s for Thonet.
These early versions had the curved under-seat to the frame.
The thick velvet type fabric to the seat and back have been on the chair for many years. They may be original to the chair as we have found Breuer chairs in the Bauhaus archives with the same type of fabric.