Prospero Collection of ancient Greek coins to be sold at auction . Trove for over 100 years by private collectors , hidden away for past two decades . Most valuable coin expected to sell for $ 5000 ; collection estimated at $ 8 million . Gold coin with head of a female ` ` a masterpiece of ancient Greek art ''
Prospero Collection of ancient Greek coins to be sold at auction . Trove assembled over 30 years by private collector , hidden away for past two decades . Most valuable piece expected to sell for $ 650,000 ; collection valued at $ 8 million . Gold coin featuring head of a satyr `` a masterpiece of ancient Greek art ''