sealed beam, headlamp unit 5-3/4"12V 35 50 Watt halogen. USA ''sealed beam'' style. Mandatory in the U. S. from 1939 to 1984; in either regular or halogen versions since it was forbidden to ride drive any vehicle on a public road with replaceable light bulbs. In 1984 H 4 was finally approved and introduced. In the sealed beam the ''light bulb'' is sealed into the unit and cannot be removed. These are non EU approved period correct classics!