This Sea‑Dog Line #1004 light bulb, part number 441004-1, is a new old stock (NOS) replacement bulb designed for use in marine lighting systems. It features a double contact bayonet base (BA15d), making it suitable for standard sockets found in navigation lights, running lights, and interior light fixtures on boats and yachts. With specifications including 12.8 V, 0.94 A, and approximately 12 W, this bulb provides reliable illumination with about 15 candlepower. The construction includes a nickel-plated brass base for enhanced corrosion resistance, ensuring durability in marine environments. Clear glass maximizes light output, making it an ideal choice for replacing worn-out or vintage bulbs and is well-suited for restoration projects.