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This is an Anglo-Gallic hammered silver Hardi D'Argent, of Edward the Black Prince. It was struck at the Poitiers Mint in France from 1362 - 1372. The coin 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 (as not long before this coin was struck) the French Royal Army had been defeated at the Battle of Poitiers (1356), one of Edward's many victories for his father.
Obverse = ЄD PO GЄnT RЄGI ΛGЄ "Edward, firstborn of the King of England"
Reverse = PRn CPS ΛQPI TΛn "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 in excellent condition, I would grade it at least a VF for the issue.
DENOMINATION: Hardi D'Argent
CULTURE: Medieval France/England
DATE: 1362 - 1372 A.D.
SIZE: 20mm diameter
WEIGHT: 1.11 grams
ATTRIBUTION: Elias 205b; AGC 230A dies 5/a; S.8134)