Railroad Signal Lantern. Gray; cobalt blue. Metal; glass. The top of this latern is embossed, "Adlake C&O Kero." The bottom is embossed, "Adlake…USA 1415633 1415634-1415635 21660193 Canada 1921-1922. Pats Pending." The burner is marked, "Adlake 300." The font is marked, "Use Long Time Burning Oil Only No 300." The double blown molded, cobalt blue globe is embossed within a shield, "C. & O." It has a single wire guard and an outside wick adjuster.