Knoll Barcelona Chair
In Casino Royale, when Bond and M meet in M's apartment, Bond and M both sit on a Barcelona designer chair.
The Knoll Barcelona Chair was designed in 1929 by Ludwig Mies van der Rohe, for the German Pavilion, that country's entry for the International Exposition of 1929, which was hosted by Barcelona, Spain. The company Knoll bought the rights to the design in the 1960s and is currently the only official manufacturer of the chair, although many unauthorized reproductions proliferate worldwide and are sold under different marketing names.
The exact name of the color of the leather used on the chairs seen in Casino Royale is unknown. It looks like the Spinneybeck leather as pictured on the left. In M's room there are at least 3 Barcelona chairs.
In the same apartment and scene a Herman Miller Aeron chair can be spotted at the desk: it's the chair that Bond sits on when he is using M's laptop. The book that is laying in front of Bond on the table in the image on the left is Burne-Jones: The Life and Works of Sir Edward Burne-Jones.