In the February 2005 issue of NUMISMATIST
(page 63), William Anton offered a 1792 "George Washington
President" Birch Cent for an undisclosed price, describing it as
follows: "Unique Birch Cent. Gem Proof Condition. The
National Collection in Washington, D.C. has every American coin in its
cabinet except this coin = A candidate for the world's most valuable
numismatic item. Considered Martha Washington on obverse and very
first of the 1792 Mint Patterns struck."
Sources and recommended
"United States Pattern, Experimental and Trial Pieces" by J.
Hewitt Judd, M.D.
"United States Patterns
and Related Issues" by Andrew Pollock