This is a product called the AAS-3B type. It was mainly manufactured by Yuasa Battery Manufacturing, Hakkosha, and others during the Japanese National Railways era for railway signal lights. Product Name: AAS-3B type Application: 5-light signal for use on Japanese National Railways, etc. (e.g., 4V or 2V) Manufacturers: Yuasa Battery Manufacturing, Furukawa Battery, Shinkobe Electric Machinery, Hakkosha (possibly OEM) Availability: Currently out of production, primarily traded on the used market and as railway surplus.