Peter Altenbach & Söhne, Schwanenwerk, Solingen in 1925, 1928 and 1932. Brand names: '4S', 'Ariston', 'Aso', 'Canorust', 'Century', 'Cutwel', 'Efeu', 'Finedge', 'Fortunato', 'Fulmine', 'Heavy Weight...