An exceptional and documented manuscript sketch leaf in the hand of Wolfgang Amadeus Mozart (1756–1791), containing multiple brief musical sketches. The sheet includes material associated with “Der Schauspieldirektor” (K. 486) and the piano concerto in D major (K. 535), as well as several unassigned fragments later indexed in the Neue Mozart-Ausgabe and the revised Köchel-Verzeichnis under K. Anh. H 14, K. 709, and K. 710. Mozart scholars have dated the K. 486 sketch to 1786, with other notations likely added around 1788. The sheet has been published with facsimile in Neue Ausgabe sämtlicher Werke, Series X: Supplement, vol. 30/3: Skizzen (ed. Ulrich Konrad, Kassel, 1998, p. 41). The verso bears additional staves, manuscript notations, and faint watermark traces. A red wax seal and the signature of Julius André appear at lower right, confirming its descent from the André family—among the earliest custodians of Mozart’s original manuscripts. The sheet was last offered publicly in 1989 by The Scriptorium, Beverly Hills, CA. Dimensions: 8 x 10 in. Provenance: Estate of Wolfgang Amadeus Mozart → André family → Julius André → unknown → Tutzing/Hans Schneider (Catalog 136, 1968) → unknown → The Scriptorium, Beverly Hills (1989) → Private Collection, U.S. Reference: Skb 1786e, NMA X/30/3, Nr. 77; Köchel-Verzeichnis, ed. Zaslaw & Leisinger, Wiesbaden 2024, p. 1111. Pickup & Shipping: Free Sacramento pickup. Shipping via FedEx within the continental U.S. for $45 + 1.5% insurance (unless waived in writing). Toned sheet with moderate signs of handling, scattered edge wear, light creasing, and isolated staining. Red wax seal intact. Mounted to backing board.