Nocturlabe in silver-plated and engraved metal, consisting of the month and day discs, the hour disc and the alidade. Inscription on the month disk Jacob Senebier. Paris Jacob Senebier, 18th century H. 16.5 cm - Diam. 8.5 cm A similar model is preserved at the Musée de l'Horlogerie et du Décolletage in Cluses.

To know more about the history of these objects: https://www.rmg.co.uk/stories/blog/astronomy/what-nocturnal