The ONE and ONLY example of this variety recovered from the shipwreck of the S.S. Central America-! PCGS pop of 1 for this PCGS number 675623. 

Includes a pinch of gold dust retrieved from the SS Central America. Popular Liberty head with Coronet surrounded by 12 stars on the obverse. The reverse presents 1/4 DOLLAR within a wreath with berries. Crafted by Antoine Louis Nouizillet, a San Francisco jeweler who was a leading producer of Fractional Gold coinage from 1852-1858.

Gold miners mug for the camera during the California Gold Rush. This piece was made of Gold Rush gold.

Don Kagin, the author of Private Gold Coins and Patterns of the United States (1981), explains how such coins were produced:

Most of the fractional coins were made by the hammer method.... This was a process of striking where the bottom die was placed on a block, a coin blank was laid upon it, and the top die upon the blank; this top die was then struck by a sledgehammer. Blows of varying intensity would cause potions of one side or edge to be more weakly struck than another.