 The price reached an all @-@ time high in 1999 , when the finest known specimen , graded Proof @-@ 68 by the Professional Coin Grading Service , which is believed to have been the example presented to Said bin Sultan , was auctioned by Bowers and Merena for $ 4 @,@ 140 @,@ 000 . At the time of the sale , this was the highest price paid for any coin . In 2008 , a Class I example was sold by Heritage Auctions for $ 3 @,@ 737 @,@ 500 , and a Class III was sold by the same firm for $ 2 @,@ 300 @,@ 000 in 2009 . 
