Jim Duncan of New Zealand writes:

There is no other coin in American numismatics with as storied and famous a history as the Class I 1804 $1, of which only eight exist. Heritage Auctions will be offering the Mickley-Hawn-Queller specimen of the 1804 $1, graded PR62 by both PCGS and NGC, from The Greensboro Collection, Part IV, as the lead lot in its Platinum Night event on Friday, Aug. 9, the centerpiece of the company's Aug. 8-10 U.S. Coins Signature® Auction in Rosemont, IL.

"The Class I 1804 $1 is the undisputed King of American coins," said Greg Rohan, President of Heritage Auctions, "and it is always an event when one of them shows up for auction. It's the rare chance for a top collector to add their name, or the name of their collection, to a history that will never diminish in importance. It is, in many ways, numismatic immortality for whoever comes out on top, and we expect there will be many vying for that honor."

It is widely believed that the 1804 $1 was not minted until about 1834, when the State Department ordered special sets of the coins struck specifically for diplomatic purposes. Records indicated that several of the Class II and Class III 1804 silver dollars were minted after that. In fact, Mint records from 1804 indicated a delivery figure of 19,570 silver dollars, though it is commonly held in numismatic circles that these were all leftover coins dated 1803.

To read the complete article, see:The Mickley-Hawn-Queller 1804 Silver Dollar(coins.ha.com/c/item.zx?saleNo=1104&lotIdNo=7001)

To read the Queller sale description, see:HNAI the Queller Family Collection, 1804 Silver Dollar