Surely 18th century, third quarter to 1790s, and French attribution seems likely, the thumb ring interesting recalling German cavalry sabres of earlier periods.
The blade and general appearance of the sword resemble French and American horsemans sabres as seen in Neumann ("Swords and Blades of the American Revolution").
I would suggest at this point, the sunbursts on the faces of the bilobate guard may have Masonic connotation.
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