FRANCE (Rennes mint), Silver Ecu, Louis XV, 1731, mintmark 9, 27.71 grams. light toning, minimal surface corrosion, old X scratches and light adjustment marks. With original (generic) certificate from the salvagers. Recovered from: Auguste, sunk in 1761 off Nova Scotia, Canada

https://en.wikipedia.org/wiki/Auguste_(1758_ship)