One of the world’s greatest car collectors, Arturo Keller, has passed away aged 91. With wife Debra, the Mexican-born US citizen of Swiss descent was a multiple concours winner on the most revered show-lawns in the world. They took the Best of Show trophy at Pebble Beach no fewer than three times, most recently with their fabulous Mercedes-Benz 540 Autobahn-Kurier (see Octane 221). Keller made his fortune supplying automotive upholstery and lived on a secluded 650-acre northern California estate, where his collection was discreetly housed in five themed (by nation of manufacture) buildings and infrequently shown. He also transformed the estate into a successful vineyard.