The Indian Head gold pieces or Pratt-Bigelow gold coins were two separate coin series, identical in design, struck by the United States Mint: a two-and-a-half dollar piece, or quarter eagle, and a five-dollar coin, or half eagle. The quarter eagle was struck from 1908 to 1915 and from 1925–1929. The half eagle was struck from 1908 to 1916, and in 1929. The pieces remain the only US circulating coins with recessed designs. These coins were the last of their denominations to be struck for circulation, ending a series which had begun in the 1790s.