European coins were circulated within America and its colonies, with Spanish silver dollar coins being the most used. They were legal tender in the States until 1857. In 1794, the first U.S dollar coins were minted.
Despite the dollar bill not being introduced until 1862, coins were unpopular with Americans. One reason was the size compared to the value of the coin - the gold dollar (introduced in 1848) was a exceptionally small coin. The fact that a dollar coin was worth around a day's wage when it was in use and that is was so easy to lose made the coin so unpopular.
The gold dollar coin was made of 90% gold and was the smallest denomination of gold currency ever produced by the United States federal government. In the late 1840s, after America saw great gold rushed, Congress was interested in putting more gold to use in the form of currency.
In 1849, the Liberty Head coin - the first of three types of gold coins - was circulated.
In 1854, the size of the gold dollar coin was increased. Most of the third type of gold coins, which was produced in 1856-1889, were used to pay for interest on Government bonds and the cost of the Civil War.
It was only in 2011 that the Mint halted all production of dollar coins for circulation, meaning that they became collectors' pieces only.
The 20 dollar U.S.A gold coin will be part of Sala Moyua Brancas' sale on March 29 and 30, 2017. Check out the full catalog here.