This miniature portrait is signed "Bouchardy", probably for the artist of that name who was active in Paris from 1770-1799. He was noted at the time for his use of the physionotrace, see Precursors of photography: Early Visual Media - Physionotrace ... He may have also been the father of the better known artist Etienne Bouchardy (1797-1849).
The sitter is unknown, but it is interesting that he was demonstrating his loyalty to the revolution by wearing a tricolor neck scarf.
Elsewhere in the collection there is a miniature portrait by Marie Noireterre of a man wearing a similar tricolor scarf which was painted around the same time. 1145