In about 1920 I found in the archives of the Mozarteum at Salzburg a bundle of papers most probably belonging to the so-called “Mozart Legacy” (i.e., a legacy of Mozart's son, including many pieces of the property of the master himself.) This contained manuscript parts of Viennese origin produced already in the 18th century, perhaps in the Offizin Lausch. The title of the envelope of the Bass part reads: “Concerto in C: oboe principale 2 violini 2 oboi 2 corni viola e basso Del Sigre W. A. Mozart.” It was immediately clear that these parts corresponded with the famous Flute Concerto in D Major. When, later on, I reconstructed the score from them, I noticed a number of apparently unimportant deviations from the flute version which, however, turned out to be most significant, as they convinced me that I had come across the original version of this Concerto.