Wolfgang Amadeus MOZART. Offertorium Alma Dei Creatoris, for soprano, alto, tenor, and bass, 2 violins, double bass, and organ [KV 277] (Vienna, Ant. Diabelli & Co., [1826]); 9 folio-size leaves, loose (the back of the double-leaf sheet serves as a reinforced title page; slight water damage at one corner; title slightly soiled). First edition, complete with all 8 parts: Organo (double-leaf serving as title page), Soprano, Alto, Tenor, Bass, First Violin (double-leaf), Second Violin, Bass, and Cello; plus a handwritten double-leaf sheet of the Violino 2do part. Engraved music; catalog number D. and C. 2107.