the united states congress authorized the san francisco mint (also known as "the granite lady") to issue a series of five commemorative coins. said coins were the 1915s silver panama-pacific half dollar and four gold coins. the denominations of the gold coins were 1 dollar, 2½ dollars (quarter eagle), a 50 dollar round coin, and an unusual 50 dollar octagonal coin. zerbe also supervised the creation of a series of commemorative medals, an award medal, a souvenir medal, and diplomas.