Morgan's first obverse design of this type without pellets between the words in "E Pluribus Unum" combined with his reverse without pellets before and after "Five Dollars". This exact design was also used on the quarter eagle of this year J1567/P1757.
These were struck on thinner and slightly wider 25.5mm vs 21.5mm planchets than the regular issue.
About a dozen are known, several of which have been gilted.
This obverse die was also used on J1568/P1758 and J1569/P1760 and the reverse was also used on J1573A/P1763.
Photo courtesy of American Numismatic Rarities.