Liberty Head double eagle
... that the twenty-dollar Liberty Head double eagle was minted after the California gold rush as the "most efficient way to coin a given quantity of gold bullion"?
... that the twenty-dollar <b id="mwB-4"><a href="./Liberty_Head_double_eagle" id="mwB-8" rel="mw:WikiLink" title="Liberty Head double eagle">Liberty Head double eagle</a></b> <i id="mwB_A">(pictured)</i> was minted after the California gold rush as the "most efficient way to coin a given quantity of gold bullion"?