The early history of United States gold certificates is somewhat hazy. They were authorized under the Act of 3 March 1863, but unlike the United States Notes also authorized, they apparently were not printed until 1865. They did not have a series date, and were hand-dated upon issue. "Issue" meant that the government took in the equivalent value in gold, and the first several series of gold certificates promised to pay the amount only to the depositor, who was explicitly identified on the certificate itself. The first issue featured a vignette of an eagle uniformly across all denominations. Several later issues (series 1870, 1871, and 1875) featured various portraits of historical figures. The reverse sides were either blank or featured abstract designs. The only exception was the $20 of 1865, which had a picture of a $20 gold coin.