Pair of vintage CM 190 armchairs without arms for Thonet in walnut

Pair of armchairs without arm named CM 190 and designed by Pierre Paulin, edited by Thonet circa 1960. Black lacquered tubular metal structure, sitting and thermoformed plywood lined with foam and covered with velvet blue duck fabrich. They have been restored by a professional upholsterer (foam and fabric are new).