RCA BK-6B Moving Coil Miniature Dynamic microphone, 1957. Attached to a long brown cable.
BK-6B was designed as a speech microphone only - for which purpose it could be readily worn or concealed on the person, carried in the hand, or concealed in scenery. It was especially designed for correct speech balance when used informally in television broadcasting and public address applications. It was not used for music.