Conveniently enough, this alleged manuscript was never accessible to later enquirers such as Alfred Einstein and Friedrich Blume, but Casadesus described it, according to Blume, as "an autograph manuscript in two staves, of which the upper stave carries the solo part (including 'tuttis'...) and the lower carries the bass."
Coincidentally he died within a few weeks of another prominent Mozart musicologist, Cuthbert Girdlestone, and was thus almost his exact contemporary.
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