Bentley Mulsanne Key Celebrates Its Centenary Bentley's bespoke coachbuilding division, Mulliner, has designed a unique keycase to celebrate the brand's centenary. It is constructed of Dark Stained Burr Walnut with Piano Black Veneer and includes an eagle-like "B" paperweight, keys, and a booklet featuring never-before-seen 1930s 8 Litre images. <b