103-1337-403 is an incandescent panel mount indicator designed for 1" mounting hole applications with oiltight sealing capability. The indicator features a faceted transparent clear polycarbonate cap with chrome plated brass bezel, and a nickel plated brass base housing an S-6 candelabra screw base incandescent lamp. It operates across a voltage range of 6–250V, accommodating a wide variety of industrial control and signaling applications. The oiltight design with "O" rings provides protection in harsh environments, making it suitable for machinery, control panels, and equipment requiring reliable visual indication in oil-exposed or sealed enclosures.