Souvenir Portrait Of Napoleon Bonaparte And 19th Century Signatures

Memorial to Napoleon in an octagonal ebony frame with checkerboard decoration with inlays (mother-of-pearl or ivory?), mid-19th century, on the back traces of period glued strips.
Circa 1840 Return from the ashes.
Dimensions: 43 x 36 cm

In its center a silhouette of Napoleon in profile in an oak leaf (souvenir of St Helena?) framed by EIGHT signatures of Bonaparte and Napoleon in cartridges with dates in pencil.

Right signatures from top to bottom:
1.    Napoleon (1815)
2.    Bonaparte (15 Frimaire Year II)
3.    Bonaparte (10 Ventôse Year IV)
4.    Napoleon (1807)

Left signatures from top to bottom:
1.    Napoleon (1816)
2.    Bonaparte (13 Vendémiaire Year IV)
3.    Bonaparte (12 Thermidor Year VI)
4. Napoleon (1809)

Very good general condition, window changed in the 20th