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This is a medieval Anglo-Gallic hammered silver Hardi D'Argent, of Edward the Black Prince. It was struck at the La Rochelle mint in France from 1362 - 1372. It depicts Prince Edward standing beneath a canopy, he wears a coronet of a simple band around his head (as opposed to the crown of a king). He is holding a sword with his right hand and pointing to it with his left. The message to his French subjects seems pretty clear!
Obverse = ED: PO: GnS R EG AGLIE "Edward, firstborn of the King of England"
Reverse = PRn CPS*R AQIT AnIE "Prince of Aquitaine "
This coin was struck for use in English held territory in France, it had the value of a silver penny (Sterling). The coin has survived although it retains a large chip and crack.
DENOMINATION: Hardi D'Argent
CULTURE: Medieval France/England
DATE: 1362 - 1372 A.D.
SIZE: 20.37mm diameter
WEIGHT: 0.80 grams
ATTRIBUTION: Elias 206a