25 sketches of "Orpheus and Eurydice" composed by Christoph Willibald Gluck on a booklet by Ranieri de 'Calzabigi, tempera, watercolored pencil and Indian ink on cardboard, titles on the front, autograph notes for the tailoring on the back, stamps of La Sartoria Teatrale Chiappa, Milan, Turin Teatro Regio, defects, 37,5x16,5 cm.