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 in 1750 by François Étienne Blanchet and it was later given a treble ravalement in 1786 by Jacques Barberini and Nicolas Hoffmann.

Louis Diémer - One of the earliest harpsichord players of the modern era.

Louis Diémer photographed by Étienne Carjat sometime in the 1860's. 

At the time of the Exposition Universelle  in 1889, Diémer would have been more than 20 years older than he was in this photograph.  Diémer gave concerts of harpsichord music on various antique and modern instruments which were made to celebrate the 100th anniversary of the French Revolution which happened in 1779.