Saber with rotating hilt, Cassaignard blade. Naval officer? Louis XVI revolution period

Gilding on the blade and traces of gilding on the hilt. Very beautiful patina. Proper functioning of the rotating guard system
Blade marked:
Right side: DE LA MANUFACTURE DE LA MARQUE AU RAISIN A SOHLINGEN.
Left side: CASSAIGNARD Mtre FOURBISSEUR ET MAITRE ARQUEBUSIER PRES LA BOURSE NANTES
Cassaignard was the appointed supplier of numerous bladed weapons for the navy (in Nantes this is understandable), but under the revolution we find his blades with very typical decorations on many weapons of the period, sometimes completely unrelated to the navy.
Total length 83.5 cm, blade 70 cm.