In today's ultra-specialised world, many of his Formula 1 colleagues have looked askance at Fernando Alonso's decision to compete last year in the Indianapolis 500, and now in the World Endurance Championship. Alonso is untypical of his generation in regarding a weekend without a race as a weekend lost, but in times past there were many like that, and none more so than Jo Siffert.
If Stirling Moss naturally remained Rob Walker's favourite among those who drove for his private team, 'Seppi' was next up, and Walker loved to talk about him.
After Moss's career-ending accident in 1962, Rob's team continued, with Maurice Trintignant, then Jo Bonnier, but the spark was gone: "They were competent enough, but after all those years with Stirling - incomparably the best - it was a bit flat, really..."