Franco-Flemish double-manual harpsichord, originally a 'transposing' harpsichord made in Antwerp in 1617 by an unknown maker.  It was given a bass ravalement in Paris sometime between 1742 and 1750.  Then it received a major alteration when it was lavishly decorated and given a treble ravalement in 1750 by François Étienne Blanchet.  Later is was given a treble ravalement in 1786 by Jacques Barberini and Nicolas Hoffmann.

Louis Diémer

Perhaps the first professional harpsichord player of the modern era