Set of 4 modernist Mertens chairs, Belgium 1930

Rare set of 4 modernist chairs from the Mertens/Motsel firm, Belgium 1930s. Seat and backrest in molded/bent plywood, sled base in tubular chrome metal. These beautiful chairs have undergone a complete restoration, the metal shows a marked patina, and the wooden parts have been cleaned and oiled. Signed on the back of the backrest (a label has remained).