| Country | United States of America |
| Year | 1855 |
| Serie | Liberty Seated Half Dollars |
| Denomination | 50c |
| Mint | San Francisco |
| coinage-type | Liberty Seated half dollar |
| desg | PR |
| designer | Christian Gobrecht |
| diameter | 30.6 |
| edge | Reeded |
| fineness | 0.9 |
| material | 90% silver; 10% copper |
| mint-mark | S |
| obverse-description | Lady liberty is seated on a rock bearing a shield with the word LIBERTY. 13 Stars frame the periphery with the date at the bottom middle under the rock. Arrows appear to the left and right of the date. |
| pcgs-link | 6421 |
| pcgs-number | 6421 |
| prefix | Branch Mint Proof |
| reverse-description | The heraldic eagle is centered in the design with the words UNITED STATES OF AMERICA and HALF DOL. around the periphery. |
| variety | Arrows |
| weight-grams | 12.44 |
| weight-ounces | 0.36169 |
| year-display | 1839-1866 |