The furniture from the 511 series, which includes a desk, chairs, armchairs, a settee and a rocking chair, are amongst the most elegant pieces of Jugendstil furniture ever produced by Gebrüder Thonet. Nevertheless, it has not yet been possible to clearly establish by whom these pieces were desigend. It is, however, assumed that it was Marcel Kammerer. It was certainly not Josef Hoffmann who cooperated at the time with competitor J. &. J. Kohn.