Lewis and Clark Exposition dollar
... that the Lewis and Clark Exposition dollar is the only US coin with two "heads" sides?
... that the <b id="mwCyI"><a class="mw-redirect" href="./Lewis_and_Clark_Exposition_dollar" id="mwCyM" rel="mw:WikiLink" title="Lewis and Clark Exposition dollar">Lewis and Clark Exposition dollar</a></b> is the only US coin with two "heads" sides?