1989, 1990 and 2011 Silver Eagle Trio, Brilliant Uncirculated. This largest silver dollar in U.S. history contains a full troy ounce of .999 fine silver. Mintages for this popular coin have been on the rise and production numbers for these three earlier issues are lower than more recent outputs. The magnificent Walking Liberty design first appeared on the 1916 U.S. half dollar during World War I. That design is often regarded as the finest U.S. silver engraving, is much larger in this silver dollar form. The Presidential Seal reverse is a distinctive version of a design that's appeared in various forms on U.S. coins since the beginning of the 19th century.