Vintage Porcelain CAUTION POISON GAS Industrial Safety Sign Oil Gas Station OSHA. Used, see photos for exact condition. This sign is a genuine vintage item, showing signs of age, including minor rust around the mounting holes and surface wear. Original vintage porcelain enamel industrial safety sign. Used in industrial settings, particularly the oil and gas industry and shipyards, to warn of toxic gases like hydrogen sulfide. Durable yellow porcelain enamel coating. Pre-drilled mounting holes at each corner and center bottom. The blank square in the middle is an empty space intended for the specific chemical identification number e. UN/NA number or chemical formula to be added by the facility. This signage style is common for compliance with OSHA and ANSI safety standards. Size: 14.25 inches in length x 7.5 inches tall (approximately). Your satisfaction is of the utmost importance to me! Again, please contact with any issues that need to be addressed.