The New York Sale, Auction 27, Lot 231 The Prospero Collection of Ancient Greek Coins. THRACE. Abdera (c.386/5-375 B.C.), Silver Tetradrachm, 12.79g,. Griffin to left, its wings raised and the forepart of its body lifting-off the ground as if it is about to take flight, a pellet within a circle above. Rev. AΘHN / AIOΣ , statue of Athena Promachos facing, brandishing a spear and holdi...