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 . Hill said the lot , `` a masterpiece of ancient Greek art , '' had a pre-sale estimate of $ 650,000 and may eventually go under the hammer for as much as $ 1 million . 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 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 ''