The furniture pieces of the 511 series, which include a desk, chairs, armchairs, a settee and a rocking chair, are amongst the most elegant Jugendstil furniture produced by Gebrüder Thonet. Nevertheless, it has not yet been possible to determine their designer, although it is highly probable that it was Marcel Kammerer. They were certainly not designed by Josef Hoffmann, as he cooperated with Thonet’s competitor J. &. J. Kohn.