1900 Indian Cent
Struck on 
Quarter Eagle 
Gold Planchet

This is the famous 1900 Indian cent struck on a quarter eagle planchet. This was listed by Pollock because there is a  possibility that it was deliberately struck for collectors. The only problem with this is that it is not the only date known in gold. An example is also known for the year 1907 and 3 other years for Lincoln cents.

There are at least 4 known for this year including the Beck coin and the illustrated example from the 1993 ANA.