Round Box Depicting The Napoleonic Imperial Family, 19th Century

Round box in pressed tortoiseshell, the lid decorated with a gilt copper plate (?) finely chiseled in relief and protected by domed glass.
The scene represents the profiles of the members of the Napoleonic imperial family:
Napoleon I, the Little Eaglet (King of Rome), Empress Marie-Louise (wife of Napoleon), Madame Mère (Maria Letizia Ramolino Bonaparte, mother of Napoleon), Emperor Francis II of Austria (father of Marie-Louise) and his wife Ludovica Beatrix of Austria, Empress of Austria. The plate bears the engraver's signature: Heurthaux f (ecit).
Around the scene runs the inscription: NAPOL.on EMP. ET ROI – N.on Ls ROI DE ROME NE LE 20 MARS 1811 – M.lse IMP. ET R.ne – Fs II EMP. D.he – MLse B.ix IMP. D.che – SA JMP. Ms. DE NAP.on

French work from the first quarter of the 19th century.
Good general condition of conservation; note a small crack on the edge of the box.

Diameter: 8 cm – Height: 2.1 cm.