The product is a vintage sign from the Subway De-Icer Car Coney Island Overhaul Shop in Brooklyn, dating back to 1996. This collectible item likely holds historical significance as a piece of railroadiana and transportation memorabilia. The sign could have been used to advertise the maintenance and repair services offered at the Coney Island overhaul shop, providing insight into the operations of the subway system during that time period. Not metal.