Enamel Industrial Sign, Retro Enamel Sign "Helmetophone", Wall Decor, Metal Enameled Plate This is an enameled, metal sign indicating the use of a helmetophone. This industrial sign was produced in the second half of the 20th century and was hung in a factory. The sign is finished in yellow and blue enamel, it is used but in very good condition. The colors are beautiful and rich and there are two holes for hanging on a wall, door or other. It is suitable for decoration Diameter - 25 cm [9.9 in]. Very Good Condition. Please look at all the photos carefully - they are part of the description. Please read the shop policies and delivery times before purchasing. All photos are real. If you have any questions please email me. Thanks for visiting us.