The Indian Head eagle was a ten-dollar gold piece, or eagle, struck by the United States Mint from 1907 until 1933. The obverse and the reverse, designed by the sculptor Augustus Saint-Gaudens, were originally commissioned for use on other denominations. As sculpted by Saint-Gaudens, it was in too high relief for the Mint to strike readily, and the necessary modifications took months. The omission of the motto "In God We Trust" on the new coins caused public outrage, and prompted Congress to pass a bill mandating the motto's inclusion. Later editions of the coin included the motto.
Shown here is a coin struck in 1908, including the motto. See the version omitting the motto.Photograph: National Numismatic Collection, National Museum of American History