It is not French but Italian, from Venice, probably late XVIII, early XIX. The horse's head is the mark of "tolerance" imprinted in the Lombard-Venetian kingdom in objects executed before 1812.
Another mark is one of the many marks of the Mint officers with the S. Marco's lion with the initials below.
The letters GF is the silversmith's mark .
I did not find an exact correspondence in the marks reported on the books, but we know that there are many of them not yet registered.