As with many other branch-mint Morgans, the 1879-O was once considered exceptionally scarce until bag quantities began appearing in the mid 20th century. Today, the 1879-O Morgan dollar is very common through at least MS65 though becomes more challenging above that, with piece grading MS66 or better considerably rare. PL and DMPLs are much scarcer still and extremely rare in grades of MS65 or higher.
| coinage-type | Morgan silver dollar |
| desg | MS |
| designer | George T. Morgan |
| diameter | 38.1 |
| edge | Reeded |
| fineness | 0.9 |
| material | 90% silver; 10% copper |
| mint-mark | O |
| mintage | 2,887,000 |
| ngc-id | 253V |
| obverse-description | Portrait of Liberty centered. On the left are found 7 stars with the words E*PLURIBUS*UNUM followed by 6 stars on the right. The date is positioned at the bottom. |
| pcgs-link | 7090 |
| pcgs-number | 7090 |
| reverse-description | The heraldic eagle is centered holding a bunch of arrows and branch surrounded by and olive leaves. The words UNITED STATES OF AMERICA * ONE DOLLAR frame the periphery. Mint mark, if any, appears above the letters DO of DOLLAR. |
| weight-grams | 26.73 |
| weight-ounces | 0.943 |
| year-display | 1878-1921 |