The 1887/6-O overdate occurred when some 1886 dies for the Morgan dollar were retooled and punched with a 7, thus creating this overdate. A popular variety, the 1887/6-O Morgan is a scarce coin of which only a fraction of all survivors is in MS grade. Above MS63 this piece becomes very challenging and in MS64 or above it is rare. If any PLs and DMPLs exist, they are essentially unknown.
| 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 | 11,550,000 |
| ngc-id | 254B |
| 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 | 7178 |
| pcgs-number | 7178 |
| 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 |