Léon VASSEUR (1844-1917). Autograph musical manuscript signed, La Famille Trouillat, [1874 ?]; 236 oblong pages in-fol. Orchestral score of this operetta in 3 acts, libretto by Hector Crémieux and Ernest Blum, music by Léon Vasseur, first performed on September 10, 1874, at the Théâtre de la Renaissance. The composer signed at the end of act I. Attached is a manuscript by George Street, Mignonnette, [operetta in 3 acts, 1896], orchestral score by a copyist with some passages arranged by Henri Casadesus (335 p. in-fol., bound).