This French ecu coin was part of a cache found at the mouth of the Bagaduce River, indicating the area's thriving trade in the 1600s. The coin was produced during the reign of King Louis XIII, and was stamped with the profile of a person crowned with laurels. The coin also included the text "A.BENEDICTVM.1652.SIT.NOMEN.DOMINI" and "LVD.XIIII.D.G.FR.ET.NAV.REX."

Present day Castine was a contested area of overlapping Wabanaki, English and French claims for centuries. In 1674, during a period of French control, Dutch privateers attacked the fort and took the Baron of Saint-Castin (Jean Vincent d’Abbadie) and others hostage for ransom. When Saint-Castin returned to Castine in 1677, he established a trading post among Wabanakis on the Bagaduce River, about six miles from the old fort.

In 1684 Chief Madockawando’s daughter, Pidianiske (baptized as Molly Mathilde), married Saint-Castin and solidified the alliance between the French and Penobscot. Family ties and reciprocal relations gave Saint-Castin a stronger footing among Wabanaki people than the English settlers and traders encroaching up the coast.

In 1840, the Grindle family found hundreds of coins buried on their farm, this ecu coin was one of them.