Rare, but well-established branch mint proof struck in San Francisco.
| coinage-type | Seated Liberty twenty cent piece |
| desg | PR |
| designer | William Barber |
| diameter | 22 |
| edge | Plain |
| fineness | 0.9 |
| material | 90% silver; 10% copper |
| mint-mark | S |
| mintage | 10-20 est. known |
| ngc-id | 27H2 |
| obverse-description | Lady Liberty is seated on a rock, holding a staff, and bearing a shield with the word LIBERTY on a flowing ribbon. 13 stars have adorn the periphery and the date appears at the bottom center. |
| pcgs-link | 5307 |
| pcgs-number | 5307 |
| prefix | Branch Mint Proof |
| reverse-description | An eagle is prominently featured with the words UNITED STATES OF AMERICA * TWENTY CENTS around the periphery. The mint mark appears in the vertical space between the eagle and Y C of TWENTY CENTS. |
| weight-grams | 5 |
| year-display | 1875-1878 |