...as Heuer progresses with making more of the range waterproof. It's a lot easier to put a O-ring seal behind a circular section pusher stem than behind a bar pusher. They seem to have taken a piecemeal approach to the order of models being waterproofed and some still have bar pushers a decade or so after the first waterproof one with round pushers. I think there are a number of models where the art designers in the catalogues beat the actual engineers to the punch too, if only virtually!