Several confusing remarks have crept into this post. France had 2 silver standards through the nineteenth century, and the twentieth century until 1972: 800 standard and 950 standard. Neither of those are sterling standard, which is 925. The sterling 925 standard was not adopted in France until 1972, in accordance with European Community legislation. Therefore, saying that an object is French sterling 950 is inaccurate and confusing. Saying the object in this post could be 925 standard silver is inaccurate.
The only way to tell the silver standard of this item is to see the silver standard mark, which the OP has not shown yet. It will be either 800 standard or 950 standard, unless the object was manufactured after 1972, which is doubtful in this case given the provenance of the object. It would be unlikely that the silver standard mark would be a Minerva head on a light object of this kind; it usually would be a crab or boar's head if the object dates post-1838. Best to wait for word from the OP.
The coronet is that of a French count. To say it could be that of a baron is misleading, as barons have their own coronets. I would be interested in any references comparing use of coronets in France and Britain, in particular referring to light-handed use of coronets in France.
What we have now is a lot of speculation, mostly misleading. Best to wait for word from the OP.