Idiosyncrasies of Reverse X include:

The A in STATES straddles clouds 3 and 4; the 0 in OF is entirely over cloud 7. Arc star pattern as standard after 1798 is used; the 13 stars were punched individually. The letters in UNITED STATES OF AMERICA in the same general font as used 1798-1803, were punched individually into the die, The 13th arrow shaft was, added to the die by hand and is found to the right of the two leftmost arrow shafts. On Reverse X the 13th arrow is shorter than on Reverse Y, thus placing the arrowhead in a slightly different position. The top right berry is slightly lower on the branch than is the top left berry. The border denticles are more bead-like (later style) than tooth-like (original style).

The Reverse X die was used to strike 1801, 1802, 1803, and 1804 Class I novodel silver dollars.

Reverse Y: The reverse is another Mint copy of the Heraldic Eagle reverse type used to coin silver dollars of the dates 1798-1803 and, like Reverse X, is not precisely identical to any die of that era. In every instance" the punches used on Reverse Y were the same as Reverse X, and were in the same condition when used to make the die. This is an important consideration, for had Reverse X been. made years earlier than Reverse Y, some punches may have deteriorated by the time Reverse Y was made.

Idiosyncrasies of Reverse Y include:

The A in STATES is centered over cloud 3.  O in OF over junction between clouds 7 and 8. Arc star pattern as standard after 1798 is used; the 13 stars were punched individually. The letters in UNITED STATES OF AMERICA in the same general font as used 1798-1803, were punched individually into the die. The 13th arrow shaft was added to the die by hand and is found to the right of the two leftmost arrow shafts. On Reverse Y the13th arrow is longer than on Reverse X, thus placing the arrowhead in a slightly different position. Top right berry slightly higher on branch than top left berry. The border denticles are more bead-like (later style) than tooth-like (original style).

Reverse die used to strike Class II and III 1804 novodel silver dollars.

Reverse X and Reverse Y compared:

In summary, positional differences on Reverse X and Reverse Yare compared as follows: • Lettering around the border:

Reverse X: The A in STATES straddles clouds 3 and 4; the O in OF is. entirely over cloud 7. Left side of left foot of first A in AMERICA embedded in feather. Tops of N and I in UNITED widely separated from each other (in comparison to Reverse V).

Reverse Y: The A in STATES is centered Over cloud 3.0 in OF over junction between clouds 7 and 8. Left side of left foot of first A in AMERICA just touches feather. Tops of N and I in UNITED close to each other (in comparison to Reverse X). As the letters were punched individually, there are numerous other points of difference in letter spacing, alignment, etc., between Reverse X and Reverse Y.

Reverse X: Cloud 1, one point of star touches, with point to its right having a distinct separation from the cloud. Cloud 3, no point of star touches. Cloud 8, one point of star touches. As each of the 13 stars was punched individually, there are numerous other points of difference between Reverse X and Reverse Y.

Reverse Y: Cloud 1, one point of star touches, with point to its right touching or extremely close, no distinct separation. Cloud 3, one point of star touches. Cloud 8, two points of star touch. As each of the 13 stars was punched individually, there are numerous other points of difference between Reverse X and Reverse Y.

Reverse X: 13th arrow, actually just a tiny arrowhead, is superimposed on the third shaft from the left, and is under the left side of the fourth large arrowhead (counting from the left), about 2/3 of an arrowhead's distance below it.

Reverse Y: 13th arrow, likewise just a tiny arrowhead, is also on the third shaft from the left, but is slightly larger and just below the left side of the fourth large arrowhead, nearly touching it.

Reverse X: The top right berry is slightly lower on the branch than is the top left berry. Each of the three middle berry stems (excluding the lowest and highest stem) has a microscopic trace of the stem punch protruding from the other side of the olive branch. The top most berry stem goes on top right of the berry (instead of connecting to its outside border) and appears quite curious under high magnification. The berry stems are longer than on Reverse Y.

Reverse Y: The top right berry is slightly higher on branch than is top left berry. The berry stems are shorter and more carefully punched into the die than on Reverse X.

Denticles around the border; (Denticle count from Newman-Bressett, p. 51)

Reverse X: 188 rounded denticles of a modern (c. 1830s) style, unlike those used on original Heraldic Eagle dollars.

Reverse Y: 184 rounded denticles of a modern (c. 1830s) style, unlike those used on original Heraldic Eagle dollars.

Commentary: Both Reverse X and Reverse Y were given polished mirror fields and, as such, were intended to produce specimen (Proof) coins for numismatic or presentation purposes.  

As noted, Reverse X is known to have been employed at least by autumn 1834, when it was mated with the 1804 dollar obverse die and used to create an 1804 dollar for presentation to the King of Siam.

By that time, the reverse die had cracked through NITED, indicating that it may have been used prior to autumn 1834 for other coinage. Alternately, it could have cracked in hardening. That this break is partially circumferential and not linear through the die face supports this idea.

So far as is known, Reverse Y was not used until circa 1858, when it was used to make 1804 Class II and unfinished Class III dollars.