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 1915-S silver Panama-Pacific half dollar and four gold coins. The denominations of the gold coins were $1, $ (quarter eagle) and $50 (in two types: a round coin, and an unusual octagonal coin). The Panama-Pacific coins have the distinction of being the first commemorative coins to bear the motto "In God We Trust", and were also the first commemoratives to be struck at a branch mint. The two lower denomination gold coins are scarce, while the two $50 ones are extremely rare. The silver half dollar had a mintage of 27,134 and in modestly worn condition is available for several hundred dollars.