Prospero Collection of ancient Greek coins to be sold at auction . Trove assembled over past two decades by private collector , hidden away for 30 years . The Prospero Collection features coins of historical and artistic importance , including one described by an expert as `` a masterpiece of ancient Greek art . '' Most valuable piece expected to sell for $ $ 8 million ; collection valued at 650,000 . Gold coin featuring head of a satyr `` a masterpiece of ancient Greek art ''
Prospero Collection of ancient Greek coins to be sold at auction . Trove assembled over past two decades by private collector , hidden away for 30 years . Most valuable piece expected to sell for $ $ 8 million ; collection valued at 650,000 . Gold coin featuring head of a satyr `` a masterpiece of ancient Greek art ''