This listing is for a vintage brass steam whistle or pressure relief valve from Capitol Brass Works. The item is clearly marked 'CAPITOL BRASS WKS.' and '10 LBS.', indicating its manufacturer and likely a pressure rating. Crafted from solid brass, it exhibits a beautiful aged patina consistent with its historical nature. It features a lever mechanism, characteristic of older steam valves or whistles. This piece is ideal for collectors of industrial antiques, steam engine enthusiasts, or those looking for unique decorative items. Please refer to the images for detailed condition and measurements, as this is an older item and sold as-is.