Many nations minted Trade Dollars for specific use in colonies or for other non-domestic markets. The U.S. Trade Dollar was specifically for use in China, to compete against the Mexican Peso, and the Britsh Trade Dollar.
The U.S. Trade Dollar has the destinction of being the largest U.S. coin minted for circulation, massing in at 420 grains. This fact is proudly proclaimed on the reverse of the coin, along with "900 FINE". The obverse of the coin has a picture of a seated Liberty holding an olive branch. The reverse features an eagle holding arrows and an olive branch. This coin was minted from 1874-1878, and in very limited numbers from 1879-1885.