I've seen a couple of interviews where it said van Hooydonk wore a "vintage TAG Heuer watch" (sic) but the latest issue of CAR magazine confirms that he was in fact wearing a Heuer Calculator. Trying to find a clear photo or video of it now, but interesting to note that an influential industrial designer also has a fondness for the vintage Heuers. Even if they are the biggest, clunkiest one of all :)