It appears to be authentic 18th century French silver cup properly marked with pre-revolutionary marks.
The marks are as follows:
- Charge and Discharge marks for Jurisdiction of Reims used between 1781-1789
- Maison Commune mark for Sainte-Menehoulde used between 1785-1787 (old mark)
- Maison Commune mark for Sainte-Menehoulde used in 1785 (new mark with number 84)
- Maker's mark for Jean-Joachim Jouette who became master in 1759