This is the earliest gold pattern of a denomination greater than one dollar. One of these was offered as lot 669 in E. Cogan's 5/1860 sale.
Two obverse dies were used for this design with different date placements.
Pollock called the first die the high date variety with the 7 close to the lowest curl in Liberty's hair but it would probably be more accurate to call it date right. The second Pollock referred to as the low date, which shows the 7 far from the hair curl, but this should really be called the centered date. About a dozen combined from both dies are known, several of which have been gilted.
4 obverse JA1857-3/P3140 and one reverse JA1857-4/P3141 die trial, struck in white metal, are also known.
Photos used are courtesy of Superior.