I to was thinking that the missing bezel was odd. It makes me wonder if there where any other car designers of the period such as Larry Shinoda or Tom Tjaarda that had Heuers. Maybe there is a whole other subset of people who had/wore Heuers that we don't really even know about?

: Perhaps the watch had some sentimental value which kept it being
: worn after the 'slide rule' loss. But then you'd imagine that
: he'd have been able to have the part replaced, assuming that
: they were still available by the time of the loss. Odd. Yes I'd
: imagine that the Calculator would appeal to your typical car
: designer of the time, as no doubt would the Monaco had it not
: become 'racer-ised' - I'm assuming that this advert dates from
: pre-Le Mans when it was still intended to appeal to architects,
: designers etc. But then the narrative seems a bit 'flamboyant'
: to be aimed at that demographic ?!... And getting back to the
: Calculator, we should mention the bracelet in the shot which
: looks correct for the model ?