野牛镍币
The Gold Eagle was re-designed in 1907 as the Indian Head eagle and the $2.50 and $5 pieces followed in 1908. The Liberty Head Double Eagle was replaced with the St. Gaudens Double Eagle in 1907. The wheat penny, with the head of Lincoln on the obverse, was introduced in 1909. The wheat penny was the first American coin that featured the face of an actual person (rather than Liberty). Also, the Buffalo nickel and Mercury dime were both introduced in the 1910s (1913 and 1916, respectively).