U.S. Toughest Find for the Date 1879-O Morgan Silver Dollar. The New Orleans branch mint of the Old South was converted to an armaments factory by the Confederacy. It didn't re-open as a minting facility until after the Reconstruction Era, when these first O-mintmark Morgans emerged a year later than the inaugural issues of other mints. Three times as many 1879 Morgan silver dollars were struck at the San Francisco Mint and five times as many at the principal Philadelphia Mint. Nicely detailed Very Fine quality.