Vintage Double Fresnel Nippon Sento Navigation Light – Masthead Light. To discover why we are your best connection to original nautical salvaged items! This is a Vintage Double Fresnel Nippon Sento Navigation Light salvaged from a once working vessel. Navigation lights are an iconic item in the nautical community. Red, green, and clear lights are required when away from the dock between sunset and sunrise and periods of restricted visibility. This particular navigation light is a White masthead light. They would be located at the bow of a boat with 225-degree visibility. It was made in Japan by Nippon Sento Co. This double-stacked light is made of solid brass and copper. The clear Fresnel lenses are in good condition, with minor chips and scratches. Base: 9.75? X 9.5? Fresnel Lens: 5.5? Weight: 11.4 lbs. And see some of the projects we are working on!