Glenn Horowitz, a rare-book dealer who handled the auction for Mr. McCarthy, told The New York Times earlier this week: “When I grasped that some of the most complex, almost otherworldly fiction of the postwar era was composed on such a simple, functional, frail-looking machine, it conferred a sort of talismanic quality to Cormac’s typewriter. It’s as if Mount Rushmore was carved with a Swiss Army knife.”