WHEN STERLING COOPER Draper Pryce moved into its new offices in the Time Life Building, the year was 1964. Herman Miller was the go-to furniture company for creative offices at that time, so it made sense that Mad Men set designer Claudette Didul-Mann would outfit the set with desks and chairs from the company’s 1964 catalog. To do that, Didul-Mann had to find vintage pieces, not reissues. She had to call Herman Miller’s research department to inquire about the year certain Swag Life chairs would’ve been upholstered. And no Lounge Chairs—showrunner Matthew Weiner thought it would be a cliché.