Thank you, Beth1! Very interesting to see these "lesser" jewels!
Another watch was part of the French Crown Jewels: it was presented in 1828 to King Charles X by the Dey of Algiers, Husseïn ben El-Husseïn. It was spared from the auction of the Crown Jewels in 1887, and was attributed to the Louvre Museum (I think that the watch is currently not on display, unfortunately).
Here are two pictures from the former display case of the Crown Jewels in the Louvre's Apollo's Gallery (pictures from our fellow poster Lorenzo's wonderful website http://diamantsdelacouronne.free.fr/index.html ):