No, this isn’t a French discharge mark. First, it is too large, and second, the placement is wrong. Marks on a pre-Revolutionary spoon would be on the back of the stem, not the front of the spatula. Third, it doesn’t make sense to have a discharge mark alone - indicating a tax obligation had been discharged - without a charge mark, as well as other marks.
Just as a side note, French silver was not sterling standard (925/1000) until 1972.
Sorry, can’t help you more than this.