The famous intaglio cent. These were struck from the hubs which is why Pollock placed these in the Splasher section 3000 number series in his book.
It is believed by some to be part of the experiments by J.T. Barclay to prevent counterfeiting.
The pedigrees, as well as the number actually known, are far from clear. The first occurrence for one of these was Lot 2439 of the 1870 Fewsmith sale and the second was lot 2660 and 1/2 in Haseltine's 1873 Chubbuck sale. Another was part of the 1873 Seavey Descriptive Catalog #150 which became the Parmelee coin. The R. Coulton Davis example sold as lot 1052 in 1890 prior to the Parmelee offering and an example appeared in the Chapman brothers April 1903 sale of the George Eavenson collection. The 1907 Stickney sale coin (he died in 1894) was purchased by Virgil Brand (journal id #39007), another was in H Chapman's 6/1908 Taylor-Windle sale lot 1309 and Judson Brenner displayed one in the 1914 ANS Exhibition.
Judd's and Lohr's were pictured on page 101 of the July 1946 edition of Numismatic Review.
At a minimum, the following 3 appear to be different with one or 2 more likely to exist.
1) Lohr ?, Pine Tree 9/74, Crouch-Superior 6/77 which is slightly off center.
2) Judd ?, Loye Lauder sale - NGC66.
3) StacksBowers 2011 ANA, StacksBowers 8/2012 ANA, StacksBowers 1/13 - PCGS65, supposedly traceable back to 1866, illustrated above.
Photo courtesy of Stacks-Bowers.