It wasn't wearing ruby slippers at the time, but the autographed manuscript of "The Plough and the Stars" by Irish playwright Sean O'Casey was sold on Wednesday for about $68,000 anyway, auctioneers Christie's said. The buyer was Bernard Quaritch, leading London book dealers. The seller was not identified. "The Plough and the Stars" is about the effects on the people of a Dublin tenement of the violent Easter uprising in the city in 1916 against British rule. When staged at Dublin's Abbey Theater in 1926, the play provoked riots, and O'Casey was accused of distorting Irish life.