The E-Sylum: Volume 4, Number 41, October 7, 2001, Article 6
SACAGAWEA DOLLAR TRIAL PIECE
Saul Teichman writes: "Your readers might be interested in
the following dollar trial piece made at the U.S. mint to test
the new "Brass" planchets in 1999 before the Sacagawea
dies were ready.
http://uspatterns.com/uspatterns/marwasdesons.html
It is regrettable that the coin was not given to the mint
collection, but was instead only photographed there."