It was given a new number in the sixth edition of the Köchel catalogue, K. Anh.C 14.05, as part of the Anhang C designated for spurious or doubtful works which have been attributed to Mozart at some time.
First published in 1933 in a version for violin and piano, the concerto was said by Casadesus, the "editor", to have been arranged from a manuscript by the ten-year-old Mozart, with a title page containing a dedication to Madame Adélaïde, the fourth daughter of King Louis XV.
In what was surely a nose-tweak at those fooled by this imposture, Casadesus also reported[1] that "The upper stave is notated in D, the lower in E".
[2] (Fritz Kreisler, the famed violinist, had written several pieces in the styles of composers such as Gaetano Pugnani, Giuseppe Tartini, and Antonio Vivaldi which he had originally passed off as compositions by these older masters.)
Many others expressed similar doubts, but only in 1977 during a copyright dispute did Casadesus admit his authorship of this alleged "Mozart" work.