1835 Classic Head Quarter Eagle
Walter Breen notes that Wayte Raymond reported five examples, Breen himself verifies three, and David Akers cites five auction appearances (which may include duplications of the same coin). To say that fewer than a half dozen exist would seem to be correct, and perhaps the number is closer to three or four. The number originally minted in Proof is nowhere recorded. As there was no special reason (such as a new design) for coining them, apart from inclusion in year sets, it could well be the case that fewer than 10 were made.
The example to the left was sold by Stack's Bowers Galleries in the Louis E. Eliasberg United States Gold Coin Auction, where it realized $30,800.