From Wikipedia
The keyboard glockenspiel (French: jeu de timbre) or organ glockenspiel is an instrument consisting of a glockenspiel operated by a piano keyboard. It was first used by George Frideric Handel in the oratorio Saul (1739). It was also used in the 1739 revivals of his Il Trionfo del Tempo and Acis and Galatea, and the next year in L'Allegro, il Penseroso ed il Moderato. Half a century later, Wolfgang Amadeus Mozart employed a strumento d'acciaio in The Magic Flute (1791) to represent Papageno's magic bells. It is now considered proven that Mozart meant a keyboard glockenspiel.