Here is the second of three coins that were among the highlights of Heritage Auctions' recent Platinum Night auction at the Central States Numismatic Society convention in Illinois.

Beyond the top quality Stellas, another highlight was a 1794 Flowing Hair half dollar graded Very Fine 25 by Numismatic Guaranty Corp. that sold for a strong $705,000.

The variety — Overton 109 — is unique in silver, although two copper impressions from the die pair are known (both are impounded in museum collections). 

Six obverse dies are currently known for 1794 half dollars, and the obverse die used for this example is unique to the O-109 die marriage. The offered coin was discovered by Robert P. Hilt, who cherrypicked the variety sometime in the late 1970s, and its prior ownership history remains unknown. 

Heritage’s sale marked the first time that the unique coin had been offered at public auction.

Keep reading about rarities sold during Heritage Auctions Platinum Night:

1880 Coiled Hair gold Stella leads CSNS auction

1933 Indian Head gold $10 eagle

More from CoinWorld.com:

Court rules in favor of Langbord family in 1933 Saint-Gaudens double eagle case

Langbord case: What are those 1933 Saint-Gaudens double eagles worth?

The £34 million worth of silver coins from SS City of Cairo wreck have been melted

The curious 1837 dime in an NGC black holder (or, when a coin in an MS-65 slab is valued like an MS-67)

NGC grades first Mint State 68 1884-CC Morgan dollar while still in its GSA holder

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