Some more information from the Chateau de Versailles:
https://en.chateauversailles.fr/disc...zart-1763-1764
Bear in mind that even at this age, Wolfgang had already composed symphonies and opera as well as numerous keyboard sonatas and pieces for violin and chamber groups. I'm not sure if the Mozarts took a harpsichord or fortepiano with them. I imagine any royalty or rich patrons would want to show off what sophisticated instruments they owned, and from experience harpsichords are fragile and tempermental things. We are very careful when taking one in a Mercedes with soft suspension; imagine a cart on eighteenth century roads.